omission/omit
omission/əuˈmiʃən/n. [u] & [c]省略，删节；遗漏：an unfortunate omission不幸的遗漏The omission of the girls was unfair.把女孩排除在外是不公平的。by omission由于疏忽：Several···
on
on/ɔn/ I.prep.1.在…上：Put your book on the desk.把你的书放在课桌上。2.在…时候；和…同时：on New Year’s Day (Friday)在元旦(星期五)；on (the morning of) July 1st在7月1日(上午) 3···
once
once/wʌns/ I.adv.1.一次：He went to London once a week.他每周去一次伦敦。2.一度，从前：Her poems were once very popular.她的诗一度很流行。3.用于习语(all) at once1.突然：All at onc···
one/oneself
one/wʌn/ I.num.一：Page One第一页‖II.pron.1.一个，一只；一个人：He is one of my best friends.他是我最要好的朋友之一。One should do one’s (或his) best.一个人应该尽最大努力。2.(用···
ongoing
ongoing /ˈɔnɡəuiŋ/adj.继续进行的，前进的：the ongoing debate (negotiations)持续的辩论（谈判）The problem is ongoing.这个问题尚未解决。
onion
onion/ˈʌnjən/n.［c］&［u］洋葱，洋葱头：an onion bulb洋葱头；boil onions with the beef洋葱烧牛肉；green Chinese onion大葱；spring onion小葱
online
online/ˈɔnlain/ I.adv.在网上：search for information online在网上搜索信息‖II.adj.网上的：browse the online information浏览网上的信息
only
only/ˈəunli/ I.adv.仅仅，只：They have only one bicycle.他们只有一辆自行车。He drinks water only.他只喝水。［考句］Only by shouting at the top of his voice was he able to make hi···
onset
onset/ˈɔnset]/n. [u] 1.开始：at the onset of the war战争开始时The drug must be taken from the onset of the infection.这种药必须在感染的最初期就开始服用。2.攻击：the sudden onset ···
