lower dead centre

简明释义

下死点

英英释义

例句

1.During the test, we measured the timing when the crankshaft was at the lower dead centre 下止点.

在测试过程中，我们测量了曲轴处于下止点时的时间。

2.The design of the engine allows for smooth operation even when the crank is at the lower dead centre 下止点.

该发动机的设计使其即使在曲轴处于下止点时也能平稳运行。

3.To adjust the timing, you need to rotate the crankshaft until it reaches the lower dead centre 下止点.

要调整时机，你需要旋转曲轴直到它达到下止点。

4.The piston reached the lower dead centre 下止点, allowing the engine to begin its compression stroke.

活塞到达了下止点，这使得发动机开始了压缩行程。

5.The mechanic explained that the engine would not start if the pistons are stuck at the lower dead centre 下止点.

机械师解释说，如果活塞卡在下止点，发动机将无法启动。

作文

The concept of lower dead centre is primarily associated with mechanical engineering, particularly in the context of engines and pistons. To fully grasp this term, it's essential to understand its significance in the operation of internal combustion engines. The lower dead centre (LDC) refers to the lowest point that a piston can reach within a cylinder during its stroke. This position is crucial because it marks the end of the exhaust stroke and the beginning of the intake stroke in a four-stroke engine cycle. When the piston is at the lower dead centre, the volume of the combustion chamber is at its maximum, allowing for the intake of air and fuel mixture necessary for the next cycle.Understanding the lower dead centre also helps in comprehending how engines generate power. As the piston moves from the lower dead centre to the top dead centre (TDC), it compresses the air-fuel mixture, which is then ignited by a spark plug. This ignition creates a rapid expansion of gases, pushing the piston down once again, thus generating power. Therefore, the lower dead centre plays a significant role in the efficiency and performance of an engine. In addition to its mechanical implications, the lower dead centre can also serve as a metaphor in various aspects of life. Just as a piston must reach this point before it can move upward again, individuals often experience moments in their lives where they feel they have hit rock bottom. These moments, while challenging, can serve as a turning point, providing the opportunity for growth and progress. For instance, someone might face setbacks in their career or personal life, feeling as if they are at their lower dead centre. However, it is essential to recognize that from this point, there is potential for upward movement and improvement.Moreover, the idea of hitting a lower dead centre can be seen in various fields, including sports, education, and personal development. Athletes may encounter periods of poor performance or injury, akin to reaching their lower dead centre. Yet, through perseverance and training, they can bounce back and achieve greater heights. Similarly, students may struggle academically, feeling as though they are at their lower dead centre, but with effort and support, they can overcome these challenges and excel.In conclusion, the term lower dead centre is not only a vital concept in mechanical engineering but also serves as a powerful metaphor for resilience and recovery in life. Understanding this term allows us to appreciate the mechanics behind engine performance while also recognizing the importance of overcoming obstacles in our own lives. Just as a piston must reach its lower dead centre to propel itself forward, we too can rise from our lowest points and strive for success.

“下死点”这一概念主要与机械工程相关，特别是在发动机和活塞的上下文中。要充分理解这个术语，首先需要了解它在内燃机运作中的重要性。下死点（LDC）指的是活塞在其行程中可以达到的最低点。这个位置至关重要，因为它标志着排气行程的结束和进气行程的开始。在四冲程发动机循环中，当活塞处于下死点时，燃烧室的体积达到最大，从而允许吸入空气和燃料混合物，为下一周期做好准备。理解下死点有助于理解发动机如何产生动力。当活塞从下死点移动到上死点（TDC）时，它压缩空气-燃料混合物，然后通过火花塞点燃。这种点燃会迅速扩展气体，推动活塞再次向下，从而产生动力。因此，下死点在发动机的效率和性能中发挥着重要作用。除了机械意义外，下死点还可以作为生活各个方面的隐喻。就像活塞必须达到这一点才能再次向上移动一样，个人在生活中常常会经历感觉自己已经触底的时刻。这些时刻虽然具有挑战性，但可以成为转折点，提供成长和进步的机会。例如，有人可能在职业或个人生活中面临挫折，感觉自己处于下死点。然而，认识到从这个点出发，有向上移动和改善的潜力是至关重要的。此外，达到下死点的想法可以在体育、教育和个人发展等多个领域中看到。运动员可能会遇到表现不佳或受伤的时期，这类似于达到他们的下死点。然而，通过坚持和训练，他们可以反弹并取得更大的成就。同样，学生可能在学业上挣扎，感觉自己处于下死点，但通过努力和支持，他们可以克服这些挑战并取得优异成绩。总之，术语下死点不仅是机械工程中的一个重要概念，也是一种关于韧性和恢复力的强大隐喻。理解这个术语使我们能够欣赏发动机性能背后的机械原理，同时也认识到在我们自己的生活中克服障碍的重要性。就像活塞必须达到它的下死点才能向前推进一样，我们也可以从最低点崛起，追求成功。