很难说

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

清楚形势究竟有多复杂。

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

计划能否成功还。

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

两条船中哪一条先进港都。

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

我们是否能及时赶到那里还。

He's a hard nut to crack.

他是个服的人。

There's no telling what may happen.

会发什么事。

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点钟以前赶到伦敦，可是事情往往准。

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

哪一个对我最重要，然而，仅有一件能提醒我在阴影之地持下去所需要的勇气和拔精神。

It is hard to say.

。

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

报告多得摸着头绪, 责任该由谁负。