她确信她的决定是正确的。
She ___knows ___for ___certain that her decision was right.
我们确信这个项目会成功。
We ___know ___for ___certain that the project will succeed.
没有人确切知道岛民是如何搬运这些雕像的。
No one ___knows ___for ___certain how the islanders transported the statues.
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