It's not yet clear who will actually enforce the blockade.

目前还不清楚到底谁会来执行封锁。

《柯林斯英汉双解大词典》

It isn't yet clear whether the new law can actually be applied retroactively.

这项新法令是否具有追溯力还不清楚。

《柯林斯英汉双解大词典》

It's not yet clear whether his resignation offer is a serious one, or whether it's simply a tactical move.

还不清楚他的辞职请求是认真的，还是只是个策略上的举动。

《柯林斯英汉双解大词典》

It is not yet clear who Mr.Zardari is expected to meet with, or what concessions he may be prepared to make.

VOA: standard.2009.03.13

And although we don't have machines that can reason about a lot of subjects yet, it seems pretty clear.

虽然还未曾出现,具有推理能力的机器,这一点相当明确

耶鲁公开课 - 死亡课程节选

Exactly how the differences in bacteria might make vaginally born babies less prone to allergies and asthma isn't yet clear, but it does point to a difference that researchers can look at going forward.

VOA: standard.2010.06.30

It is not yet clear if and when his case will come to trial.

BBC: Former Auschwitz Nazi guard Hans Lipschis found in Germany

It is not yet clear whether the penguins are male or female, keeper Mairee Vincent said.

BBC: Endangered penguin chicks hand-reared at Whipsnade Zoo

Exactly how the merged companies will use their sales forces is not yet clear.

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