a【 ei】 
一个，任何一，每个
 A mistake can cause an accident.一个错误就可能导致一场事故。
 An artist is sometimes a painter.一个艺术家有时也是个画家。
abandon【 ə'bændən】 
vt.放弃，遗弃；n.放任，狂热
Never abandon a friend in need.
永远不要放弃任何处于患难中的朋友。
 The ship was sinking and had to be abandoned.这艘船正在下沉，所以只有弃船了。
abbreviate【 ə'bri:vieit】 
v.缩写，缩短，简化，简写成，缩写为
When signing a letter, I prefer to use my initials, thereby abbreviating my name.
签字的时候，我喜欢用我名字的首字母来缩写我的名字。
 The word "don't" is an abbreviation of the words "do not".词组“don't”是“do not”的缩写。
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abbreviation【 ə,bri:vi'eiʃən】 
n.缩写，缩写词
AI is an abbreviation for "Artificial Intelligence."
AI是"Artificial Intelligengce"（人工智能）的缩写。
 John was recalled to work, abbreviating his vacation.约翰被召回工作，休假也因此缩短了。
abide【 ə'baid】 
vi.坚持，遵守； vt.忍受，容忍
As long as you are in this city, you are expected to abide by its laws.
只要你在这个城市，你就得遵守它的规章制度。
 This Summer I will abide in the mountains for three weeks.这个夏天我会在山上待三个星期。
ability【 ə'biliti】 
n.能力，才干
The teacher had the child read aloud to test his ability.
为了检验这个孩子的能力，老师让他大声读出来。
 He was a renowned artist of great ability.他是一个才干卓越的知名艺术家。
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able【 'eibl】 
adj.可……能，能够……能力，有本领，有才能，有能力，有资格，展示才能
He is able to communicate in Italian.
他能够用意大利语交流。
 All able-bodied individuals are asked to help.所有有能力的人都被要求去帮忙。
abnormal【 æb'nɔ:məl】 
adj.反常的，变态的
Someone who is bi-polar exhibits abnormal behavior.
那种走极端的人会有反常的行为。
 The steady rain caused an abnormal rise in the river's water level.持续的大雨会导致河流水位不正常的上涨。
aboard【 ə'bɔ:d】 
adv.在船（飞机、车）上，上船（飞机、车）；prep.在（船、飞机、车）上，上（船、飞机、车）
Arrive early so that you can get aboard the train on time.
早点来，你才能准时上火车。
 Good morning. Welcome aboard this flight.早上好。欢迎乘坐本航班。
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