E

　　71.each other 互相，彼此

　　They help each other in work. 他們?cè)诠ぷ髦谢ハ鄮椭��?/P>

　　They congratulated each other on their success. 他們互相慶祝成功。

　　72.either…or 或……或，不是……便是

　　The letter may arrive either today or tomorrow. 信或者今天或者明天到。

　　Either he or you are right. 不是他就是你對(duì)了。

　　73.engage in 從事，忙于

　　He is engaged in writing a book. 他忙著寫(xiě)一本書(shū)。

　　He is engaged in writing a letter of invitation. 他在忙著寫(xiě)邀請(qǐng)信。

　　74.enjoy oneself 玩得愉快，感到快樂(lè)

　　Did you enjoy yourself at the party? 聚會(huì)過(guò)的愉快嗎?

　　We enjoyed ourselves heartily at the dance. 我們?cè)谖钑?huì)上玩的十分愉快。

　　75.even if/though 即使，縱然

　　I will go even if it rains cats and dogs. 即使下大雨我也去。

　　You won't mind even if he doesn't come. 即使他不來(lái)，你也不要介意。

　　76.expert in 擅長(zhǎng)

　　She is expert in playing the piano. 他擅長(zhǎng)彈鋼琴。

　　Hi is said to be expert in English speech. 據(jù)說(shuō)他擅長(zhǎng)英文演講。

　　77.familiar with 熟悉，通曉

　　Make yourself familiar with the foreign customs soon. 要盡快熟悉外國(guó)的風(fēng)俗。

　　Only practicing more can help you to be familiar with your work. 只有多實(shí)踐，你才會(huì)熟悉工作。