A: I do not think I have achieved enough yet.
B: Well, if you always aspire to do your best then you will not be unhappy.
aspire
vi.渴望，追求，有志于

A: Is that a donkey or an ass ?
B: Neither, it is a small horse.
ass
n.1.笨蛋，傻瓜 ;2.驴

A: Did you hear that there was an attempted assassination on the president?
B: Yes, but it was not true, somebody was spreading rumours.
assassination
n.刺杀，暗杀

A: We were warned about the risk of assault in the city.
B: Good, it is always better to be aware of the dangers.
assault
vt.(武力或口头上的)攻击，袭击

A: He asserted his points strongly during the debate.
B: Why didn’t he win it then?
assert
vt.1.肯定地说，断言 2.维护，坚持
A: I think that guy is too rude.
B: Really, I think he is just trying to assert himself .
assert oneself
坚持自己的权利，显示自己的权威

A: I think that the new student has assimilated well into his new environment.
B: Perhaps, but he does not seem to have many friends.

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