与橡木相比，其他木材的膨胀和收缩速度不同，所以用这些木材做的橡木船的修理会出现裂缝或漏水。

Other woods expand and contract at different rates than oak, so repairs to oak ships done with those woods split or leak.

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因为一架钢琴主要是由木材制成的，木材受到温度和湿度影响会引起音板轻微的膨胀和收缩。

Because a piano is made primarily of wood, it's affected by changes in temperature and humidity which cause the soundboard to expand or contract slightly during these changes.

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