The physics teacher now sets up a transverse wave on a long elastic cord by moving her hand up and down, as shown in the diagram below.
物理学教师现在让有弹性绳子的以横向波形式上下移动，如下面的图解中所示。
Esme was already moving; her hand touched an inconspicuous keypad on the wall, and with a groan, huge metal shutters began sealing up the glass wall.
艾思梅已经行动了起来，她的手按上墙上的一个隐藏着的按钮，然后，只听一声轻响，巨大的金属百叶窗开始降下来封闭住了玻璃墙。
And I recall ensuring all my limbs were safely inside the moving vehicle, in contrast to her friend in grammar school who learned to write with her left hand after that grade eight field trip.
我记得那时她只是要使我安全地呆在飞奔的汽车中，不要把手脚伸出去。这和她的语法学校的一个朋友形成了对比，她的那个朋友在一次八年级的实地考察旅行之后学会了用左手写字。
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