After some initial problems, acetone was successfully produced in quantity.

解决了最初的一些问题后，成功地生产出了大量丙酮。

The development of sharing economy has resulted in the number and variety of sharing bikes to increase in quantity.

共享经济的发展使得共享单车的数量和种类大量增加。

It's cheaper to buy goods in quantity.

大宗购物比较便宜。

The drug was produced in quantity and became cheaper.

于是这种药投入大批量生产，价格也比以往便宜。

The only thing increasing in quantity is plastic bags.

唯一增加的数量是胶袋。