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1·My grammar finds an ABC when it is available, but settles for an A, or AB, when that is all there is to find.

我的语法当其条件允许时找到了一个 ABC，但是当只能找到 A 或者 AB 时，也能满足于此。

2·Therefore the regular expression A*B will match the strings AB, AAB, AAAB, or any other string starting with an A and ending with a single B.

因此，正则表达式 A*B 将与字符串 AB 、 AAB 、 AAAB 或任何其它以 A 开头并以单个 B 为结尾的字符串相匹配。

3·It's an amazing place, AB said, but our hotel room was filthy and we ate the same thing every day. Noodles for breakfast and rice for dinner.

“那真是一个神奇的地方。” AB 说，“但是我们的酒店房间很脏，而且每天都吃同样的食物。早餐面条，晚餐米饭。”

4·The agreement was declared void ab initio.

此协议自一开始就被宣布无效。《牛津词典》

5·What does this observer ab extra represent?

这置身局外的观察者代表了什么？

6·First we have the Pilot of some small night-founder'd skiff, and the pilot stands ab extra, from outside, in the simile.

首先我们看这句“迷茫深夜中，轻舟的导航人”，在这个明喻中，导航人从诗句之外向内眺望。

7·There's a second figure here standing ab extra, and that's the moon hovering overhead: while over-head the moon / sits arbitress.

这里有第二个置身事外的角色，就是高高挂在头顶的月亮：“月亮高挂天心，像个公正的决断人。”

8·Hartman associates this image of Milton's standing ab extra with the figures in so many of those similes who seem also to be standing ab extra.

哈特曼把弥尔顿从外俯视的形象，和众多的明喻中似乎也置身局外的形象相联系。

9·Hartman describes Milton's tendency in Paradise Lost, and he takes this term from Coleridge: the tendency to stand ab extra, to stand from outside.

哈特曼描述了弥尔顿在《失乐园》中的倾向，他借用了柯勒律治的这个习语：由外而内俯视自身的趋势。

10·Let AB be perpendicular to CD.

设ab垂直于CD。《新英汉大辞典》

(1)ab initio（拉）从头开始