Pre-solar grains are now estimated to make up a small part — only 100 parts per million — of the comet.
前太阳系颗粒估计填补了一小部分彗星成分——只有万分之一。
When the pre-set time is up, the connecting passage is clear and the air-operated sounding element is forced to make sound by the airflow.
当达到预置时间时，连接通道畅通使气流作用于气动发声元件发声。
Not just an added reinforcing ring, this unique pre-compression design compensates for expansion forces generated from normal tapered pipe thread joint make-up.
不仅仅增加了加固环，这种独特的预压缩结构能够抵消常规锥形管道螺纹连接结构所会产生的膨胀力。
A strong Chelsea line-up saw Michael Ballack make his first appearance of the Blues' pre-season following his late return to the squad after Euro 2008 duty with Germany.
切尔西强大的首发阵容中我们看到了巴拉克，他自08欧洲杯代表德国参赛后在蓝军的季前热身中首次亮相。
A strong Chelsea line-up saw Michael Ballack make his first appearance of the Blues' pre-season following his late return to the squad after Euro 2008 duty with Germany.
切尔西强大的首发阵容中我们看到了巴拉克，他自08欧洲杯代表德国参赛后在蓝军的季前热身中首次亮相。
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