artificial 人工的，人造的，人为的 artificial price controls

　　ascend 登高，(渐渐)上升，升高 The airplane ascended into the cloud.

　　ascertain 查明，弄清，确定 I ascertained that he was dead.

　　ashamed 惭愧的，羞耻的 I am ashamed for being so stupid.

　　ashore 向岸，向陆地 He swam ashore.

　　aside 在旁边 We stood aside to let her pass.

　　assault 攻击，袭击 We made an assault on the enemy fort.

　　assemble 集合，召集 assemble the members of Parliament for a special meeting.

　　assert 肯定地说(出)，坚定地断言 He asserted his innocence.

　　assess 估价，评价，评论 assess the present state of the economy

　　assign 分配，布置(作业) The teacher assigned (us) a new lesson.

　　assimilate 吸收，消化 He is quick to assimilate new ideas.

　　associate (使)联系，(使)结合 We naturally associated the name of Darwin with the doctrine of evolution.

　　assume 假定，假设 Farmers will have a bumper harvest, assuming (that) the weather si favarable.

　　assure 深信不疑地对......说，向......保证

　　assurance 保证，把握，信心 He gave me his assurance that he would help.

　　astonish 使惊讶 I was astonished at his sudden appearance.

　　attach 系，贴，连接 attach a label to a suitcase

　　attain 达到，获得 attain one’s goal

　　attend 出席，参加(会议等) attend a wedding

　　attendance 出席，参加，出席人数，出席率 Our class has perfect attendance today.

　　attentive 注意的，专心的 an attentive audience

　　attribute 把归因于，把......(过错的责任等)归于(to) He attributed his success to hard work.

　　auxiliary 辅助的 an auxiliary rocket

　　avail 有利于，有助于 Will force alone avail us?

　　average 平均数，平均 The paper receives an average of nearly 100 articles a day.

　　avert 挡开，防止，避免 Many traffic accidents can be averted by courtesy.

　　awake 醒，觉醒 awake from sleep