He's tired because he worked hard all day today.
他疲倦是因为他今天紧张工作了一整天。
He's very tired because he worked hard all day today.
他很疲倦是因为他今天整天都在很紧张地工作。
He was given the Nobel Prize because he had worked so hard for peace.
他为和平事业辛勤工作，因而获得诺贝尔奖金。
He was given the Nobel Prize because he had worked so hard for peace.
他为和平事业辛勤工作，因而获得诺贝尔奖金。
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