It is unclear how much popular support they have among the island's population.

目前还不清楚他们在岛上的民众中间有多高的支持率。

Just what the soldier was doing in Bireij is unclear.

就连那个士兵在比雷杰干什么都不清楚。

His itinerary is still unclear.

目前仍不清楚他的行程安排。

He is still unclear about his own future. [+ about]

他仍然不清楚自己的将来会怎样。

Experts remain unclear as to why the danger appears to have been steadily increasing.

专家依然不清楚为什么危险似乎一直在增大。