Definition: to know something without doubt Level: C1
我们确信这个项目会成功。
We ___know ___for ___certain that the project will succeed.
她确信她的决定是正确的。
She ___knows ___for ___certain that her decision was right.
没有人能确定未来会怎样。
No one can ___say ___for ___certain what the future holds.
