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I realized,swallowing hard,that about half of them had since died.这句话中since什么意思,翻译.

题目详情
I realized,swallowing hard,that about half of them had since died.这句话中since什么意思,翻译.
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答案和解析
since 是自从的意思,省略了since they were died引导的时间状语