例句：It is no easy job to find every reason for the increase in the number of teenagers who run away from their homes, but, on the whole, two factors shout louder than others. First of all, …. Second, …

4.In contrast with the drawbacks/demerits/flaws of sth., sth. else can serve as a better step/move/advance in the right direction/toward the solution for the problem of…

例句：In contrast with the drawbacks caused by nuclear power, the solar power can serve as a better move toward the solution for the problem of energy crisis.

5.It is true/obvious that sth can’t compete/be compared with sth else in…, but sth still enjoys/secures/possesses distinct/substantial advantage over sth else.

例句：It is obvious that radio cannot compete with television in visuality, but it still possesses substantial advantages over television. (One of these is…Another…Still another…)

6.But if…, it is easy/not difficult/hard to see/find/discover that…