日语
韩语
法语
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西班牙语
意大利语
阿拉伯语
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俄语
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泰语
that That he will come and help you is certain. 他来帮助你是确实无疑的。
whether Whether there is life on the moon is an interesting question. 月球上有没有生命是个有趣的问题。
who what which whatever What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。 Who will win the match is still unknown. 谁能赢得这场比赛还不得而知。
whether Whether there is life on the moon is an interesting question. 月球上有没有生命是个有趣的问题。
who what which whatever What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。 Who will win the match is still unknown. 谁能赢得这场比赛还不得而知。
