The superior was suspicious of his survival, — he thought the soldier might be a traitor.

他的上级怀疑他的幸存-他认为士兵有可能是个叛徒。

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They declared him (to be) a traitor to the country.

他们公开宣布他是国家的叛徒。

youdao

It would be difficult to dismiss him as a traitor.

ECONOMIST: Tran Do, a dissident in Vietnam, died on August 9th, aged 78

When Lord May, the former chief scientist of Britain, said in September that religion might be needed to secure humanity's future, he was denounced by fellow secularists as a traitor.

ECONOMIST: Religion and climate change