以前

Live so as to annul some previous behavior.

活着为了取消以前的一些行为。

We have had the extensive studies on theα-acetyl-α-carbamoyl ketene--acetals and its further applications, for example, their adols condensations with aldehydes giveα-alkenoyl-α-carbamoyl ketene--acetals which can be utilized as the 1,5-bielectronic five-carbon components to react with various binucleophlilic species in a [5+1] annulation.

我们小组在以前的工作中对α-乙酰基-α-胺甲酰基二硫缩烯酮在合成中的应用进行了深入的研究，如与醛缩合生成α-烯酰基-α-胺甲酰基二硫缩烯酮，将其作为1，5-双亲电五碳合成子的[5+1]成环策略等。

This clearly indicates that the negative value of dρ/dT in CdYb QCs is mainly due to the quasiperiodicity because these QCs are stoichiomeric compounds with a very narrow single phase range. Positive dρ/dT and anomalously large MR reported previously are found to be due to the existence of free Cd in the samples.

这清楚地显示CdYb准晶的负电阻温度系数是由於准周期导致，因为CdYb准晶是一种单一相范围极窄的当量化合物，以前的研究说其具有正的dρ/dT和异常巨大的磁阻是由於样品中含有金属Cd。

Anselm's treatment of the theme raised the discussion to a much higher plane than it had occupied in previous discussions.

anselm的治疗为主题，提出讨论，以高得多的飞机比它已占领以前的讨论中。

Before whaling the largest population 239,000 (range 202,000 to 311,000) was in the Antarctic[5] but now there remain only much smaller (around 2,000) concentrations in each of the North-East Pacific, the Antarctic, and the Indian Ocean.

据统计，半个世纪以前，全世界的蓝鲸大约还有30万只之多，到1974年尚有25000只，而现在仅剩有大约2000只了。

Will no longer return to the status quo ante.

就不会再恢复到以前的状况。

Both ant and anteater are nodes in a network of tissue launched by that primeval cell long ago and made ever more distinguished and specific over the eons.

蚂蚁和食蚁兽都是这种原始细胞很久以前就建立起来的组织网络中的节点。随着时间的推移，蚂蚁和食蚁兽的区别变得越来越明显和具体。

There are many antebellum houses in the area.

这个地区有许多南北战争以前的房屋。

For most workers, however, the antebellum period was one of rising wages and higher standards of material well-being.

然而，对于大多数工人来说，南北战争以前的这段时间是工资与物质生活水平均有提高的时期。

Under the special transitional pattern, that is the separation of politics and economy, the economy as the forerunner, incremental reform, and experimental units as antecedence, resolute goal and "blurred" advancement, the transition of the social insurance system inevitably depends on the "historical" road and on the "realistic" road.

在回答这四个问题以前，本论文对国内、国际时代背景和文献背景情况做了全面、清晰的概括，它既是本文选题的依据，也是回答前面四个问题的前提和基础。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。