1.
(biology) retained; not shed.
（生）保持的，不脱落的。
2.
retention of subject matter
教材的保持 教材的保持
3.
under the aegis of...
在...的保护[支持]下
4.
not remaining rigid or straight.
不保持刚硬或不保持直的状态。
5.
To adhere to established rules or predetermined courses of action.
保持一致坚持保持成规或预先确定的行动方案
6.
The Relationship Between Water Conservation and Soil Conservation
论流域水土保持中水保与土保的关系
7.
It is my pride that keeps me up.
保持高姿态，是我的骄傲。
8.
moisture retentivity of soil.
土壤对潮湿的保持力。
9.
maintained at a certain atmospheric pressure.
保持特定的空气压力。
10.
mental reservation
对某项声明所持的保留
11.
Bear down to keep one's unbeaten record intact
努力保持不败的记录
12.
an insurance run
保持领先局面的步跑
13.
I will. Please keep in touch.
我会的。希望保持联系。
14.
get on with a performance.
继续保持这样的表现
15.
they kept in daily contact; they claimed that they had been in contact with extraterrestrial beings.
他们保持日常的联系。
16.
the act of restoring to a more youthful condition.
使人保持更年轻的状态。
17.
joint record holders
一个纪录的共同保持者
18.
time a manufacturing process.
保持制造过程的时间