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。
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.
尽管女性的工资在提高，但劳工部的统计数据显示，自1960年以来，女性收入与男性收入的比率基本保持不变。
Although women's wages are improving, Department of Labor statistics show that the ratio of their earnings with that of men have been roughly static since 1960.
对于一些上线后的网站来说，它们的css基本保持不变的。
For many sites the CSS will remain fairly static after it launches.
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