HSK 7-9
筋
jīn名
muscle; tendon; veins visible under the skin; sth resembling tendons or veins (e.g. fiber in a vegetable)
芹菜的粗筋需要提前去掉。
Qín cài de cū jīn xū yào tí qián qù diào.
The tough fibers in the celery need to be removed first.
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Appears across levels (7-9) in the HSK 3.0 word list.