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																										- 她说话含含糊糊,我怎么也听不明白她想说些什么。
She is so vague that I can never understand what she is trying to say. 
																										- 我不明白你们为什么对这件事感到如此好笑。
I fail to see why you find it so amusing. 
																										- 我真不明白,什么原因使你这么匆匆忙忙地放弃了这样一个很有前途的职位。
I really fail to understand what actuated you to give up such a promising post so hastily. 
																										- 未知数数值不明的一个数量
A quantity of unknown numerical value. 
																										- 造成死亡的直接原因不明。
The immediate cause of death is unknown. 
																
							 
						 
					 
				 
			
			 
		
		
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