1.It can be seen that precleaning alone would not reduce the total sulfur content of the four coals to levels anywhere near the standards.
可以看出，这四种煤的总含硫量仅靠预先洗选将不能降低到完全接近标准规定的水平。
2.In a precleaning policy, modified pages are written to secondary memory once they have been selected for replacement.
在预约式清除策略中，被修改的页一旦被选中作为替换，将会被写入辅存中