劍橋詞典a muscle in the shoulder , shaped like a triangle and used for lifting the arm （肩上的）三角肌 Always stretch your deltoids after lifting weights . 提擧重物以後一定要舒展一下三角肌。 The deltoid muscle lifts the arm sideways . 三角肌使手臂能夠側(cè)擧。 返回 deltoid