- an unknown quantityn.未知量，难预测的事;未知数，不知底细的人（或事物）;
- an exception to一个例外
- an element of一点点，少许;
- an average of的平均值.
- an apple of discordn.争端，祸根;
- an advice一个建议
- a means to an end用以达到目的的方法;
- be an eyesore有碍观瞻；碍眼;
- confirm to确认
- confirm in确定（某人）在…中的位置;坚定某人的信念;
- come to an agreementv.达成协议;说妥;敲定;谐;
- call for an end to something呼吁结束某事
- it is an inescapable fact that这是一个不可避免的事实
- give an opinion on对…发表意见;
- in an instant立即，马上;须臾之间;斯须之间;弹指之间;
- make an inquiry进行查询
- make an impression on给…留下印象;
- make an excuse for找借口;
- make an attempt to试着尝试一下
- make an appeal to someone吸引某人
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