自从开展活动以来 Since undertaking activities since ; Since its activities ; Since the activities since the
从原始的实验开展以来，许多研究探索了这个旁观者效应。
Since the original experiments, many studies have explored the bystander effect.
地质大调查工作开展以来获得了大量的地质资料，取得了一批丰硕的调查成果。
We have obtained a great deal of geological data and survey achievements since the geological survey began.
创先争优活动开展以来，该公司将解决职工拖欠工资作为给职工办实事的一项重要工程来抓。
Good campaign started, the company will address the employees wage arrears to workers and do practical things as a major project task.
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