是/b/音。

baby， big， back， before...

This little baby is the hope of our whole family.

这个小婴儿是我们全家的希望。

The shoes are too big for me.

这双鞋对我来说太大了。

The back pain left the patient suffering.

背部疼痛让这个病人受尽了折磨。

I will brush my teeth beforebreakfast.

我会在早餐前刷牙。