unclear例句

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。

To this day, it's unclear whether he shot himself or was murdered.
至今尚不清楚他究竟是饮弹自杀还是被谋杀。

"Things are moving ahead."— I found that statement vague and unclear.
“事情正在取得进展。”——我认为这个说法含糊不清。