One should never lose his heart when he is in trouble, because adversity can always serve as a paving stone to success.
即便身处困境，也不该丧失信心，因为困境能够充当成功的铺路石。
The Thenardier woman snatched up an enormous paving-stone which lay in the angle of the window and served her daughters as an ottoman.
德纳第大娘从窗旁的屋角里拿起她女儿平日当凳子坐的一块奇大的石磴抱在手里。
铺路石生产线；
铺路石生产线；
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