“不清楚”用英语怎么说

还不清楚船舵是如何断裂的。It was not yet clear how the rudder had sheared off.就连那个士兵在比雷杰干什么都不清楚。Just what the soldier was doing in Bireij is unclear.不清楚飞机是坠毁在陆地上还是海里。It isn't clear whether the plane went down over land or sea....