三变量的 trivariate
一则童话三百年的演变 Little Red Riding Hood Uncloaked
生产率的三种变量 productivity variables
这是永恒不变的铁三角 This is the eternal triangle
根据初春天气一日三变的特点，衣服不可顿减，过早脱去冬衣，极易受寒伤肺，引发呼吸系统疾患。
According to the characteristics of early spring weather day three, clothes do not reduce meal, early winter coat off, extremely easy cold lung injury, respiratory system diseases.
有人会用一颗豆子和三个杯子做让人困惑的戏法游戏，这让人难以理解。眼下，就有一场类似的戏法要变，只不过赌注可不只是一把黄豆。
There's a trick they do with one pea and three cups which is very hard to follow, and something like it, for greater stakes than a handful of loose change, is about to take place.
无需购买任何昂贵的健身器材，你也能把家变成健身房。一个星期做三次下面的练习，不用一个月你就能变瘦变苗条。
Turn your home into your gym without buying any expensive equipment. Try these exercises three times a week, and you'll see results in less than a month.
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