n. an injury that doesn't break the skin but results in some discoloration
v. injure the underlying soft tissue or bone of
v. break up into small pieces for food preparation
v. damage (plant tissue) by abrasion or pressure
n. 青肿, 挫伤, 擦伤
vi. 受伤, 擦伤
vt. 使受伤, 研碎