科学家不花费时间研究打哈欠。那可能因为打哈欠不会伤害人，它只是我们做的某事。
Scientists do not spend time studying yawning, that is probably because yawning does not hurt. It is just something we do.
科学家不花费时间研究打哈欠。那可能因为打哈欠不会伤害人，它只是我们做的某事。
Scientists do not spend time studying yawning, that is probably because yawning does not hurt. It is just something we do.
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