1.
The aircraft can't maintain the specific ground clearance.
飞机距地面保持不了一定的高度。
2.
Our institute retained a pole position in scientific research.
我们所在科研方面保持了有利地位。
3.
It was apparently more tenaciously held to surface than fraction three.
它比级分三更顽强地保持在表面上。
4.
save appearances
维持体面, 保全面子
5.
Research on Ground Monitoring Methods of Soil and Water Conservation of Communication Projects;
交通开发建设项目水土保持地面监测方法研究
6.
hold on the land
保持看到陆地保持与陆地接触
7.
They remain above the same place on the earth and travel round it in a very high circle .
它们（卫星）保持在地面上周一位置的上方，在高空中环绕地球运行。
8.
You want to keep the front as it is, is that so?
前面要保持原样，是吗?
9.
Would you keep the fringe as it is?
前面刘海还保持原样吗?
10.
an insurance run
保持领先局面的步跑
11.
He remained cool before the enemy.
在敌人面前他保持镇静。
12.
keep up appearances
ph.1. 装门面,2. 保持常态
13.
The region's export-oriented countries are determined to preserve competitiveness against its new giant and also against one another.
该地区面向出口的国家既要针对新巨人保持竞争力，也要相互间保持竞争力。
14.
Good ecological environment is the essential condition of keeping its economy and other social aspects developing lasting,fast and healthy.
良好的生态环境是民族地区保持其经济和社会其他方面持续、快速、健康可持续发展的必要条件。
15.
If one wants to keep ahead of your rivals, you'll have to work very hard.
要想在竞争对手面前保持领先地位，你就得努力工作。
16.
It was lit by a torch every few feet and the ground was swept and well kept.
每隔几步就有一支照明的火把，而且地面有清扫过，状况保持得很好。
17.
Although the air over the earth becomes hot, the air over the water stays cool.
虽然地球上空的空气变热，而水面上空的空气却仍保持凉爽。
18.
It confirms other evidence that the earth's surface temperature has remained approximately constant during this period.
它证实了另一个现象，在此期间，地球表面的温度几乎保持不变。