单词	胸梁--前梁
释义	胸梁，前梁breast beam
随便看	propontocypris crocata propontocypris symmetrica propopanoceras propor proporphyrin prop or post, a, proportinate selection proportion proportionability proportionable proportionableness proportionably proportionably long proportional proportional action proportional action coefficient proportional action controller proportional allocation proportional amplifier proportional arm proportional band proportional band adjustment proportional band of a controller proportional band--pb proportional bandwidth filter