HSK 7-9
壳
ké名
(coll.) shell (of an egg, nut, crab etc); case; casing; housing (of a machine or device)
小鸡正在啄破蛋壳出来。
Xiǎo jī zhèng zài zhuó pò dàn ké chū lái.
The chick is pecking its way out through the eggshell.
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Appears across levels (7-9) in the HSK 3.0 word list.