unsure

The witness was unsure of the suspect's identity because the streetlights were very dim at the time of the crime.

(Chinese) 证人不确定嫌疑人的身份，因为案发时路灯非常昏暗。

Having never traveled abroad before, Maria was unsure about the customs process at the international airport.

(Chinese) 由于以前从未出国旅行，玛丽亚对国际机场的海关流程感到不确定。