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1·It's hard to say what caused the accident.

很难说造成事故的原因是什么。《牛津词典》

2·It's hard to say at this stage how the market will develop.

在现阶段很难说市场会如何发展。《柯林斯英汉双解大词典》

3·Er, right now it's hard to say.

额，现在还很难说。

4·It's hard to say where soccer's birthplace is.

很难说足球的诞生地在哪里。

5·It's hard to say what his intentions were in saying that.

他说这番话，不知存的什么心。《新英汉大辞典》

6·But it's hard to say right now.

但是目前还很难说。

7·It's hard to say who it was.

很难说那是谁。

8·How successful? It's hard to say.

很难说有多么成功。

9·So it's hard to say.

所以很难说。

10·It's hard to say who won the third debate.

很难说是谁赢了第三场辩论。