Catching a fly ball during a baseball game in grade 5.
在棒球比赛5级中接住一个高飞球。
2
Primary uses for wrot brass are for ball valve stems and balls, and iron valve stems. a forging grade of brass is used in ball valve bodies and pieces.
黄铜的主要用途是球阀阀杆和球体，和铸铁阀门的阀杆。可锻黄铜可用于球阀阀体和断口部件。
3
The technique can not only increase greatly the thronghput capacity of the plant's ball mills, but also maintain the original grade of concentrate.