n. sag
路凹下去了。
The road caved in.
《新英汉大辞典》
凹下的手掌形和小圆点是最频繁出现的成对图形之一，尤其在温暖气候的葛拉夫特时期。
Negative hands and dots tend to be one of the most frequent pairings, especially during a warm climate period known as the Gravettian.
youdao
碰撞把我们汽车挡泥板给撞凹下去了。
The impact dented our car's fender.
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