A sea of faces betrayed their grief.

无数面孔的表情流露出内心的悲伤.

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A sea of faces beamed with joy.

无数面孔面露喜色.

《简明英汉词典》

The actor looked out form the stage onto a sea of faces.

演员从舞台上往下看,只见一片人山人海.

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The actor looked out from the stage onto a sea of faces.

这位演员从台上往下看,只见一片人山人海.

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The aim is to fill the square with a sea of faces.

它的目的是使广场人山人海.

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Believe it or not, a sea of faces.

信不信由你 —— 人山人海.

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A sea of faces , walking as well as being apt, waits being holding the ticket smile.

人山人海, 边走边爱, 拿着车票微笑等待.

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