这不是最干净的游泳之地。
即使在最干净的房间，空调格栅，加热箅子和风扇扇翅也会产生灰尘和油污。
Even in the cleanest of homes, air-conditioner griller, heating grates, and fan blades eventually develop a layer of dust and grease.
荷兰和瑞士的公司看上去是最干净的，比利时、德国和日本紧随其后。
Dutch and Swiss companies were seen as the cleanest, with Belgium, Germany and Japan close behind.
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