indentations
n. 缺口；[物]压痕；[物]刻痕（indentation 的复数）
例句
The horse's hooves left deep indentations in the mud.
马蹄在泥地里留下了深深的蹄印。
《牛津词典》
Make four indentations into the condenser near the standard cone joint .
在冷凝器接近标准圆锥接头处打四个穴孔。
Probe to find the indentations behind ears and apply pressure for 5 seconds. Repeat 3 times.
找到耳后的凹陷处，按压五秒钟，重复三次。
