例句與造句

1. In 1988 and 1989, she was issued patents for the Air Lift, a backpack carrier for portable oxygen dispensers.
2. Both normal and zero-G environments may be in areas within the vacuum of outer space; in these situations, Isaac must refill his limited oxygen supply via oxygen dispensers.
3. It's difficult to find oxygen dispenser in a sentence. 用oxygen dispenser造句挺難的