point-to-back action 针尖同向作用
The striker has only recently returned from a nasty ankle injury that has kept him out since last summer, and will be desperate to get back to action.
这位射手最近受到踝部伤痛的威胁,那使他错过了从上个夏季开始的比赛,而且重返赛场的几率很小。
Access was gained to these shops through the small alleyway at the back of the properties—it's dark and as you can imagine, no one saw the thief or thieves in action.
通过房子后面的小巷子可以进入这些商店,那里很黑,你可以想象不会有人看到小偷的行动。
After all, a little healthy worrying is okay if it leads to constructive action—like having a doctor look at that weird spot on your back.
毕竟,一点点健康的担忧是可以的,如果它能带来建设性的行动——比如让医生检查你背上那个奇怪的斑点。
We're going to come back and talk about the action potential a little bit more when we talk about how the heart works, because the heart when its contracting, the muscle cells also use action potentials to initiate contraction.
我们讲心脏工作原理时,会回头再多讨论一点动作电位,因为心脏收缩时,肌肉细胞也利用动作电位来启动收缩
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