Regulators, the gods of their ecosystem, are unwilling to let them die off.
老师您好，请问句子末尾die off必须有off吗？是因为他们是词组搭配吗？我见很多一句话结尾都是这样动词加介词的搭配。为何呢？谢谢
die off是短语动词，其中off是副词，不是介词！
die off : [for a living thing] to perish one by one until there are no more
/To become extinct gradually, as of a group of people or animals.
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