当回头时，她发现侦探正在密切观察着她。

When she looked back she found the detective was studying her closely.

youdao

凝玉回头时，玉珊瑚般的双靥上还留着末拭去的泪珠。

When Ning jade cornered head, the double of the jade coralline sort dimple up still lingered the end erased out of drop of tear.

youdao

有很多路，走的时候忘记了回头，等想回头时，已经沧海桑田。

There are a lot of road, forget when you go back, when want to look back, has changed much.

youdao

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

耶鲁公开课 - 生物医学工程探索课程节选