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来源:雅诚德英语网
The empty shell of a snail or clam may be left behind, and if it is sufficiently durable and resistant to dissolution, it may remain basically unchanged for a long period of time.
蜗牛或蛤蜊的空壳可能会被留下来,如果足够持久和抗溶解,它可能会在很长一段时间内基本保持不变。