Definition
To believe one is experiencing something that is not actually occurring, often due to hallucination or misinterpretation of sensory input.
看错、听错、想错
I could have sworn I heard someone call my name, but there's no one else in the room. I must be hearing things.
我发誓我听到有人叫我的名字，但房间里没有其他人。我一定是在幻听。
When she said she saw a ghost floating in the air, we thought she must be seeing things.
当她说她看到一个鬼魂在空中漂浮时，我们认为她一定是在幻视。
After trekking for a long distance in the desert, he started seeing water shimmering in the distance, but he knew he must be imagining things.
在沙漠中长途跋涉后，他开始看到远处有水在闪烁，但他知道他一定是在幻想。