for a landfill to be built ,the operators have to make sure that they follow sertain steps.

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for a landfill to be built ,the operators have to make sure that they follow sertain steps.
for a landfill to be built ,the operators have to make sure that they follow sertain steps.

for a landfill to be built ,the operators have to make sure that they follow sertain steps.
注:
(1) "sertain" 应拼写为 "certain" (某些特定/规定)

一个垃圾填埋场兴建,经营者必须确保他们遵守sertain步骤。

由于要建一个垃圾填埋场,工人们得按一定的步骤施工。sertain应该是Certain吧?!!!

要想建一个垃圾填埋场, 操作员必须确认他们是否在跟随着一定的步骤