Racist laws required African Americans to drink from separate public drinking fountains, climb back stairs to sit in the balconies of theaters, and wait in much smaller rooms at bus and train stations.

VOA: standard.2010.03.04

They're not responsible necessarily for moving molecules inside and out, but they sit at the outside of the cell and they wait for signals.

它们不负责将分子运进运出,而是冲着细胞外面坐等信号

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Similarly, if you're dealing with immature humans and you want your child to get you a beer, you can't just sit, wait for the kid to give you a beer and uncap the bottle " and say, "Excellent. Good. Hugs."

类似的，如果你要训练的是未成年人,如果你想让你的孩子帮你拿一罐啤酒，你就不能只是坐着，等孩子把啤酒拿给你,然后你打开瓶盖,说，“太棒了，来抱一下“

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