once(twice) a week 一周一次(两次) go to the picture show 去看画展 hundreds of(thousands of, millions of) 数以百计(数以千计,数以万计) ..
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To start out I'm going to go back to the thinking about development a little bit, embryonic development, and show you a picture here.
作为这节课的开始,我先稍微回顾一下,一些关于发育过程的内容,先说胚胎发育,这里有张图。
To start out I'm going to go back to the thinking about development a little bit, embryonic development, and show you a picture here.
作为这节课的开始,我先稍微回顾一下,一些关于发育过程的内容,先说胚胎发育,这里有张图
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