A cannula with two cavities的用法和样例：
- I share with two others in hire a car for the day.
- Can you let me have a room with two single bed?
- The inner room or parlor of a house with two rooms.
- A fan-shaped gate was used for feeing in the injection mold with two cavities for kitchenware fitting,enhancing uniformity of material feeding and reducing internal stress of the plastic parts.