in quantity造句
        After some initial problems, acetone was successfully produced 
in quantity.
解决了最初的一些问题之后,终于成功地制造出了大量丙酮。
Ores are also being obtained 
in quantity from other countries.
矿石也从国外大量输入.
It's cheaper to buy goods 
in quantity / in large quantities.
大批量购货较便宜.