1.
Help us to keep the tube litter free
请协助我们,保持地铁清洁卫生
2.
Some workers keep the tunnels and rooms clean.
有的（工蚁）负责保持地道和房间的清洁。
3.
hold on the land
保持看到陆地保持与陆地接触
4.
keep a good offing
保持离陆地远些航行
5.
You should remain as quiet as you can.
你应尽可能地保持沉默。
6.
The beds maintain their identities.
地层保持它们的均一性。
7.
There is no way to keep the place clean.
这无法保持此地清洁。
8.
Regional and departmental protectionism
地区和部门保持主义
9.
I bit my tongue sorely.
我痛苦地保持缄默。
10.
Remain the Bellwether of the catering industry
保持餐饮业的龙头地位
11.
hold one's ground; maintain a position; be steadfast or upright.
保持自己的立场；保持某种姿势；坚定地直立着。
12.
Holding our ground and extending it are inseparably connected.
保持阵地和发展阵地是不可分离的。
13.
At the same time, the natural topography and general configuration of the earth's surface should be retained.
同时要保持天然的地形地貌。
14.
The resource protection of Yanbian area land and utilization;
延边地区土地资源的保护和持续利用
15.
Inside a bowling alley: Please be quiet, we need to hear apindrop.
在保龄球馆：保持安静，我们需要倾听大头针落地。
16.
4. Protect and improve the ecological environment to ensure a sustainable use of land.
（四）保护和改善生态环境，保障土地的可持续利用；
17.
Soil and water conservation effects of protective tillage measures on sloping farmland
坡耕地保护性耕作措施的水土保持效应
18.
She keeps her footing in society.
她在社会上保持住自己的地位。