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view: n [c, u] what you are able to see or the possibility of seeing it; what you think or believe about something; a way of considering or understanding something 景色；美景；視野；想法；見解
常用短語：
have a good/ wonderful / bad view (of...) 對......能夠很好/不好得觀看
come into view 看得見；進入視野
be in view 看得見；在視野中；考慮中；計劃
in one’s view (in one’s opinion) 在某人看來
e.g. ?????? i sat in the front of the bus to get a good view of the countryside.
我坐在公共汽車的前部,以便飽覽農村風光。
as we turned the corner, a fascinating castle came into view.
當我們轉過拐角，一座迷人的城堡映入我們的眼簾。
there was nothing in view except the vast sea.? 除了浩瀚的大海以外什么也看不到。
in my view, you must have misunderstood him. 我覺得你一定是誤會他了。
6. there are four underground lines in beijing, and several lines are under construction.
= there are four underground lines in beijing, and several lines are being constructed/ built. 北京有四條地鐵線，還有幾條線也正在建設之中。
under construction: being built 在建造中；正在施工
e.g. a dam is under construction. 水壩在建筑中。
the new airport is still under construction. 新機場仍在修建中。
拓展：
under reconstruction 在重建中
under repair 在修理中；正在修理
under way 在進行中；在航行中
7. tricycles are worth using if you want to explore the narrow alleys (hutong) of old beijing.
= if you want to explore the narrow alleys (hutong) of old beijing, you may as well use the tricycle which is a rewarding way. 如果想去老北京的胡同探秘，三輪腳踏車絕對是值得一坐的。
worth: adj（作表語）having a certain value; giving or likely to give a satisfactory or rewarding return for (doing sth) 有......的價值；值得
常用結構：be worth + n./ doing sth
e.g. this bicycle is worth ￡50. 這輛自行車值50英鎊。
your computer is worth the price. 你的電腦是值這個價錢的。
although at times, learning a language was frustrating, it is well worth the effort.
盡管有時學習語言令人感到垂頭喪氣，但它卻完全值得你為之付出努力。
suzhou gardens are worth visiting. 蘇州園林值得游覽。
the dragon chronicles is well worth reading. 天龍八部非常值得一讀。
8. keep cool!
=keep calm! 保持冷靜！
keep cool: keep low in temperature, but not cold, often in a pleasant way; keep calm, not nervous. 保持涼爽；保持冷靜，鎮定自若
e.g. let’s sit in the shade and keep cool. 我們做到樹蔭下去涼快涼快吧。
don’t get excited about the examination; keep cool! 不要對考試太激動，沉著點。
keep strong, if possible. in any case, keep cool. have unlimited patience. (b. h. liddell hart)如果可能，保持強壯。任何情況，保持冷靜。要有無限的耐心。（b. h. 里德爾•哈特）