[no obj., withadverbial of direction]extend beyond or above a surface 伸出,突出 something like a fin protruded from the water. 一种像鳍的东西伸出水面。 ■[with obj.](of an animal) cause (a body part) to do this (动物)使(身体部位)突出,伸出
派生 protrusion noun protrusive adjective 语源
early 17th cent. (in the sense 'thrust something forward or onward'): from Latin protrudere, from pro- 'forward, out' + trudere 'to thrust'