开始发生

By comparison, if you tried to squeeze and release the muscles in your hand, they would grow fatigued and need to rest probably within an hour.

通过比较，当你试图挤压和释放手中的肌肉时，它们会疲倦可能需要在一小时内休息。

We are very lucky to have this one-of-a-kind addition to our Children's room.

我们非常高兴少儿部能够得到这么一份独一无二的礼物。