多数情况下，带有行星的恒星要比太阳小，这是第一类偏见。

The first type of bias is that the stars which revealtheir planets most readily are smaller than the sun.

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这是儿童游戏中第一类需要大量社会性互动的游戏。

This is the first category that involves strong social interaction between the children while they play.

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That's one class of problems.

这是第一类问题

耶鲁公开课 - 基础物理课程节选