C2 having a hole or empty space inside空的,空心的
If you have hollow cheeks or eyes, your cheeks curve in or your eyes look deep in your head because you are old, tired, or ill.凹陷的面颊/眼窝
More examples
The hollow glass tank contains hot mercury vapour.
The hollow chocolate egg held a diamond ring.
If you tap on the wall, you can hear it is hollow behind.
C2 (of situations, feelings, or words) without value, or not true or sincere(局面、情感或言语)无价值的,空洞的,虚伪的
(of sound) as if made by hitting an empty container(声音)空洞的,低沉的
a hole or empty space in something, or a low area in a surface坑,洞
US a valley山谷
noun
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