The counter of the sink has many grooves along which the water will run off.
本句,sink 是名词,指“水槽”,counter 指水槽的“台面”。
along which 引导定语从句,which 指代 grooves(槽沟),along “沿着”。
The counter of the sink has many grooves along which the water will run off.
水槽的台面上有许多槽沟,水将沿着这些槽沟流出。
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