The population of aphids is normally kept down by other animals.

蚜虫的数量通常被其他动物控制在较低水平上。

The child kept down in bed the whole day.

那个孩子一整天都在床上睡着.

The mosquitoes and flies must be kept down.

必须阻止蚊蝇滋生.

Kept down by unjust use of force or authority.

不公正地使用武力使服从。

The peasants were kept down ruthlessly by the occupying power.

占领国残酷地压迫农民.

If he failed in the exam again, he would be kept down next term.

如果他考试再不及格，下学期他就得留级。

Costs will have to be kept down if severe public censure is to be avoided.

要避免公众严厉的指责就得维持低成本。

Eg: Costs will have to be kept down if severe public censure is to be avoided.

要避免公众严厉的指责就得维持低成本。

Haas was afraid that if he failed his examinations again, he would be kept down next year.

哈斯担心他如果再考不及格， 下一年就得留级了。

He was starved for weeks, kept down the mine till the time was right, then given the scent.

它已经挨饿了好几周，时候到了才从矿井里放出来，循着气味追踪而来。