■ call

是个多义动词，即使作为不及物动词，意义也很多，取决于前后文和具体语境。

• Smith called this morning.英国英语可能是“史密斯今天上午打过电话来”或者“史密斯今天上午到过这里来拜访”。
• Smith called here this morning. 史密斯本人亲自到此拜访（如果是亲自拜访而不是打电话，美国英语则多说 Smith stopped by this morning.）。

• at once
• at one's peril
• attention
• attention 与 caution
• at that
• at the cost of
• at the expense of
• attitude
• attitude
• attitude 与 posture
• attorney
• at..., we
• at 与 in
• audience
• autograph
• available
• avenge
• avenge 与 revenge
• average
• average, median, mean
• avoid
• avoid
• avoid 与 prevent
• await
• aware