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.