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…be (randomly)
separated into … groups,based on … /
The groups were as follows …
… be (randomly) allocated (in) to … groups
3，表达“结果”：
常用句型为 We found (observed) that …/ It was found
(observed, noted, seen, recorded …) that …
常用 with 或 by 表示量的变化 ：
The prevalence increased with
age.
Cyclic AMP levels were increased by
NECA.
Cell number increased by
almost 50% during the first 24 after the beginning of treatment.
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