Each of these systems has its trade-offs, but generally the compaction phase is an expensive one in terms of time and effort.

每个这样的系统都有自己的平衡方法，但一般说来压缩阶段在时间和工作上都耗费颇多。

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This paper probes into the influence of compaction effort on gradation based on gyration compaction and sieving analysis test.

通过旋转压实试验和筛分试验，探讨压实功对混合料级配的影响。

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The effort spent on careful grading, mixing and compaction of concrete will be largely wasted if the concrete is badly cured .

如果混凝土养护得很差，那么在精心选定混凝土的级配、拌和和密实成型上所耗费的精力将是徒劳无益的。

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