英语语法分析

There are at least two classes of these receptors, which have been designated A1 and A2.

这些受体至少有两类，分别被命名为 A1 和 A2。

From signals sent by the receptors, the brain understands smells as complex spatial patterns.

通过受体发出的信号，大脑将气味理解为复杂的空间图案。

The higher their capacity to bind at the receptors, the higher their ability to stimulate locomotion.

它们结合受体的能力越强，它们刺激运动的能力就越强。