An acoustically absorbent material (e. g. a fabric) may be secured to an inwardly facing surface of any part formed from perforated sheet metal.

吸音材料(例如织物)可固定至由穿孔金属板形成的任何部分的面向内的表面。

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Both countries arealready facing severe surface and groundwater shortages (4, 5).

目前，两国都不得不面对地表地下水短缺的严峻形势 【4 5】 。

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Between blazing heat on the star-facing side and freezing cold on the dark side, the average surface temperature may range from minus 31 to minus 12 degrees Celsius, the researchers said.

研究人员还称，在炽热和寒冷的两个半球之间，该星球平均表面温度为零下31摄氏度至零下12摄氏度。

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You can move the handset (and its front-facing camera) up and down as it speeds along any flat surface, responding to commands from someone on the other end of a Skype video chat.

ENGADGET: Insert Coin: Botiful telepresence robot for Android (video)