They were trying to remove harmful substances from cigarettes.

他们正试着去除香烟中的有害物质。

youdao

They were trying to remove harmful substances from cigarettes.

他们正设法祛除香烟中的有害物质。

youdao

They were trying to remove harmful substances from cigarettes.

他们正设法祛除香烟中的有害物质。

youdao