很难说

The plan's success was balanced on a knife-edge.

计划能否成功还说。

It is difficult to convey the sheer complexity of the situation.

说清楚形势究竟有多复杂。

It is a tossup whether we shall get there in time.

我们是否能及时那里还说。

It was nip and tuck as to which boat would reach port first.

两条船中哪一条先进港说。

There's no telling what may happen.

说会发生什么事。

It is hard to say.

说。

He's a hard nut to crack.

他是说服的人。

We should get to London before 7 o’clock, but there’s many a slip ’twixt cup and lip.

我们应能在7点钟以前敦，可是事情往往说准。

But only one reminds me of the courage and persistence it takes to stay the course in the Shadowland.

说哪一对我最重要，然而，仅有一件能提醒我在阴影之地坚持下去所需要的勇气和坚韧不拔精神。

With so many reports to mislead one, it is hard to say at whose door the responsibility should be laid.

报告多得摸不着头绪, 说责任该由谁负。