be careful of

例句：

1. 1.Be careful of the sharp edges on the knife.
   小心刀子上的锋利边缘。
2. 2. Be careful of the spilled liquid on the floor.
   小心地板上的液体洒落。
3. 3. Be careful of the dangers lurking in the dark alley.
   小心黑暗小巷中潜藏的危险。