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Once they were known as"aborigines"

他们曾经被称作"土著"

That was when a loud bray made me about-face once more.

就在这时，一只驴子的大叫声使我再次转过头来。

Once he realized how important getting in to college was, his grades did an about-face, and he's getting nothing but A's now.

当他了解进大学有多么重要之后，他的成绩出现了180度的大改变，现在他的成绩全都是优。

Once he realized how important getting into college was, his grades did an about-face.

一旦他体认到念大学有多重要后，他的成绩出现一百八十度的大逆转。

She picked up her magic wand, waved it once and ABRACADABRA!

温妮拿起魔杖，晃了一下，"阿拉卡拉巴！"

The work begins abruptly and is thought to be but a fragment of a once larger whole.

突然开始的工作和被认为是，但片段的一次较大的整体。

By 1945, this abscessed condition of the Chinese people burst forth once more in renewed civil war and quickly thereafter passed over into revolution.

到了一九四五年，中国人民身上的脓包终于破裂，内战再起，并且很快发展为革命。

The house has an absentee landlord, who visits the property once a year.

这栋房子的房主不在这儿住，一年过来一次。

Once upon a time there was an absentminded man who had no equal in forgetting things, even his own identity.

从前，有一个心不在焉的人，论健忘没人能比得过他了。此人甚至连自己的身份都记不住。

I saw truth in this nation holds its absolute value once again.

我看到真实的绝对价值在这个国家得到保全。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。