It's relative weight that matters, not absolute weight.
起作用的只是夫妻间的相对体重，而不是个人的绝对体重。
X's weight and 2 may be able to observe relative weights.
或例如，1也许知道X先生的体重和2个可以观察的相对权重。
The authors write that relative weight is what is most dangerous in crashes.
研究报告的作者写道，车祸中双方汽车重量相差越大，就越危险。
My relative put on weight again, which disappointed him very much.
我的亲戚再次增加体重，这让他非常失望。
My relative put on weight again, which disappointed him very much.
我的亲戚再次增加体重，这让他非常失望。
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