There is no doubt that he is fit for the job.
毫无疑问，他能胜任这项工作。
There is no doubt that mobile phone is very important for us.
毫无疑问，手机对于我们来说非常重要。
There is no doubt that he will win the game again.
毫无疑问，他将再次赢得这场比赛。