哪些: which; who; what因素: factor; element有助于: contribute to; be conducive ...听众: audience; listeners倾听: listen for; listen attentive ...并: combine; merge; incorporate; ...留意: be careful; look out; keep o ...讲演: lecture; speech; give a lect ...内容: content; substance呢: wool; woollen cloth; heavy w ...有助于: contribute to; be conducive to; conduce to 他们的发明有助于电气工程学的发展。 their inventions have contributed to the development of electrical engineering. 体育锻炼有助于增强体质。 exercise is conducive to good health便于, 有助于: militate in favor of大大有助于: go far towards大有助于: go far toward为了，有助于: towards引起,有助于: conduce有助于，促成: contribute to有助于，有利: make for有助于打球: assisting with play有助于的: instrumental有助于复元: restorntive有助于握杆: assistance in gripping增加,有助于,促成: redound走向，驶向；有助于: make for走向，有助于: make for
