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Look before you leap：三思而后行

关键的代码片断是这样的:良好的python本能建议用"轻松获得许可"(easier to get permission)模式来替换掉"三思而后行"(look before you leap)模式(这些过程的详细讨论请看Recipe 5.4)而不是用同等的但是在语句上略逊一筹的dict.has_key(key).

Look before you leap：思而后行

(Where there is a will,there is a way.) 三思而后行(Look before you leap) 时间就是金钱(Time is money). 教室书橱中附英语文字说明的异域风情图片或异族民俗文化介绍,学生亲手设置异族民俗文化的英语黑板报. 如值圣诞节来临,黑板报上画有圣诞树,

Look before you leap：摸清情况再行动

Little things amuse little minds.小人无大志. | Look before you leap.摸清情况再行动. | Lookers-on see more than players.当局者迷,旁观者清.

Look before you leap：三思后行

山穷水尽 be at the end of one's rope(tether) | 三思后行 Look before you leap. | 事难两全 You cannot eat your cake and have it

Look before you leap：小人无大志

羊毛出在羊身上. Little things amuse little minds. | 小人无大志. Look before you leap. | 摸清情况再行动. Lookers-on see more than players.

Look before you leap：三思而后行. </P>

Like teacher, like pupil. 有其师必有其徒. | Look before you leap. 三思而后行. | Love will overcome everything. 爱情能够战胜一切.

to look before you leap：三思而后行

Russian roulette 无谓冒险 | to look before you leap 三思而后行 | to watch one's step 谨慎

Z Look before you leap：摸清情况再行动

Z Little things amuse little minds.小人无大志. | Z Look before you leap.摸清情况再行动. | Z Lookers-on see more than players.当局者迷,旁观者清.

Look before you leap：摸清环境再步履

One false move may lose the game. 一着掉慎,满盘皆输 | Look before you leap. 摸清环境再步履 | Each bird love to hear hellomself sing. 自命不凡

look black：面带怒色

23.black hole (军营中的)牢房 | 24.look black 面带怒色 | 25.black looks 怒气冲冲的样子

enamelling iron：搪瓷[用)钢板

enamelled strip || 涂珐琅钢带,搪瓷钢带 | enamelling iron || 搪瓷[用)钢板 | enantiomer || 对映体,对映异构物

leeringly：以斜眼看 (副)

leeriness 猜疑; 留神; 狡猾; 机警 (名) | leeringly 以斜眼看 (副) | leery 机敏的, 细心的; 猜疑的, 迟疑的 (形)