垫 pairs 执 zhí, the sound part, with 土 earth. It first meant to sink beneath the soil. From there came pad or cushion, and then padding. The sound link is unclear in Mandarin.
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Example Sentences
我在椅子上放了一个垫子。
wǒzàiyǐzǐshàngfàngleyígèdiànzǐ 。
I put a cushion on the chair.
这个垫子很软，坐上去很舒服。
zhègèdiànzǐhěnruǎn ， zuòshàngqùhěnshūfú 。
This mat is very soft and comfortable to sit on.
运动时，最好在地上放一个垫子。
yùndòngshí ， zuìhǎozàidìshàngfàngyígèdiànzǐ 。
It's best to put a mat on the ground when exercising.