探险家们身背沉重的背包, 吃力地,一步步地爬上雪山.
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She plonked down the heavy trunk and sat on a stone bench for a rest.
她吃力地放下那只沉重的箱子,然后坐在一张石凳上休息一下.
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Now, Bill came in sight plodding up the hill. Jane laughed and she called to him.
就在这时, 比尔出现了,他正吃力地从山下爬上来, 简笑着叫他.
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They trudged forward, more slowly and painfully than they had done yet.
他们脚步沉重地前进, 比以前更慢更吃力了.
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