Tension arises in different parts of the body, and the body as a whole contracts.

紧张感在身体的不同部位产生，整个身体收缩。

Looking at your body as a whole, you should picture them as two sides of a scale — sometimes it's balanced in the middle, and sometimes it leans to the left or right, depending on what's happening.

把你的身体作为一个整体来看，你应该把它们想象成天平的两边——有时它在中间是平衡的，有时它向左或向右倾斜，这取决于发生了什么。

Larger species tended to have higher maneuverability, in part due to their larger wing size and muscle capacity-- not just in relation to smaller species but in relation to their bodies as a whole.

较大的物种往往具有较高的机动性，部分原因是它们的翅膀尺寸和肌肉容量较大——不仅与较小的物种有关，而且与它们的整体身体有关。