Horses evolved in discrete steps, each of which persisted almost unchanged for millions of years and was eventually replaced by a distinctive newer model.
马是分阶段进化的,每一阶段都几乎保持了数百万年的不变,而最终被一种独特的新型马所取代。
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。
We're a traditional British restaurant so there are some staples that will remain essentially unchanged.
我们是一家传统的英国餐馆,所以有些主菜基本上不会改变。
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