To be honest, there was a lot of fog that night,说实话那晚雾很大

to be honest说实在的, 老实说

To be honest,I'd be rather reluctant to go dancing.

说实话，我非常不愿去跳舞。

To be honest,I'd prefer a glass of water.

说真的，我想喝杯水。

It would have been really hard to land there under those conditions in the dark.在那种情况下飞机很难在夜晚降落

in the dark在黑暗中； 秘密地

He felt along the wall in the dark for the door.

他在黑暗中沿墙壁摸索着找门。

He ran against a lamp post in the dark.

在黑暗中他撞上了一根电线杆。

相关短语：be in the dark as to完全不知道,蒙在鼓里

Why have you let me be in the dark about this?

你为什么一直将我蒙在鼓里?

I am in the dark about it until she tells me.

这件事在她告诉我之前，我毫不知情。