我不想干预这么多，但我想我们应该在克隆人的问题上划定界限。
I didn't want to interfere with all that, but thought we should draw the line at human cloning.
准备一条有标记的绳子或者是100英尺的卷尺，用来给场地划定界限。准备一个与脚同宽，长约4英尺的木板，用以压倒麦秆。
You will need a marked rope or a 100ft measuring tape to mark out the site, and a foot-wide wooden board about 4ft long to do the flattening.
“划定界限”代表了谈判的象征边界。
The "line in the sand" represents a symbolic border for negotiations.
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