nieklarowny 用英语:

His reason for not going is still unclear.

It is still unclear what caused the accident.

The situation at the moment is unclear

It's unclear what actually happened that night.

The details of the contract are unclear.

It is unclear in Patterson's experiment whether the output objects fully correspond to the designed models.

Their scope and shape is unclear.

There were assassination theories but it was not clear who would have killed him and for what reason. Even now the truth about his death is unclear.