If you aren't in doubt, use them anyway.(如果現在還沒疑問，將來無論如何也要用到它們。)

The success of the court remains in doubt.(此次庭審是否能夠成功，還存在懷疑。)

The outcome was still in doubt.(結果仍不確定。)

When in doubt, use your own gear.(如果有疑問，請使用自己的裝備。)

So the outcome is not really in doubt.(那么，最后的結果不存疑慮。)

His intellect and mental agility have never been in doubt.(他的才智和頭腦的敏銳從未被受到懷疑。)

His inclusion in the team is in doubt.(他是否能被選入這個隊還未定案。)

A suggested explanation, so long as its correctness is still in doubt, is called a hypothesis.(提出來的解釋，只要它的正確性仍然有疑問，便稱為假說。)

If in doubt, consider a synchronized wrapper.(如果情況不確定，考慮使用同步包裝。)

His loyalty to his friends was never in doubt.(他對朋友的一片忠心從來沒受到懷疑。)