Plug bathtub and sink drains to prevent sewage backup.
塞好浴缸与水槽的下水口，以免污水倒流。
Check to see that water and sewage lines are intact before using the toilet. Plug bathtub and sink drains to prevent sewage backup.
如厕前要检查水管与下水道管道，确保它们完好无损。塞好浴缸与水槽的下水口，以免污水倒流。
She pulled out the plug of the bathtub.
她拔下浴缸的塞子。
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