1.
The Genetic Analysis & Gene Mapping of Earliness Trait in New Rice Preserver Line D64B;
杂交水稻新保持系D64B早熟性状的遗传分析和基因定位
2.
It actually means @keep in touch.
应该说“保持联系。”
3.
The Relationship Between Water Conservation and Soil Conservation
论流域水土保持中水保与土保的关系
4.
hold [keep up] correspondence with sb
与某人（保持）通信（联系）
5.
Maintain the liquid sewage disposal system in good working condition;
应保持该系统运行良好。
6.
I will. Please keep in touch.
我会的。希望保持联系。
7.
You know, we should try to stay in touch.
我们应该常保持联系。
8.
I will be in touch with you
我会跟你保持联系。
9.
We'll keep in touch with you.
我们将和你保持联系。
10.
You 'll stay in touch, will not you ?
你会保持联系，不是吗？
11.
You have to keep in touch with your parents.
你必须和双亲保持联系。
12.
kept in touch with several classmates
和几位同学保持联系
13.
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。
14.
Please keep in touch with me any time.
请随时与我保持联系。
15.
maintain a close contact
保持密切接触［联系］
16.
maintain friendly relations, contacts, etc
保持友好关系、 接触等
17.
Maintaining Relation with Foreign Companies
保持和外国公司的联系
18.
He kept up a correspondence with Tom.
他和汤姆保持通信联系。