Throwing objects around your yard such as football or a volleyball can be another drill you can take on.
在你的院子里扔东西，比如足球或者排球可以是你做的另一种练习。
The soldiers were at drill in the barrack-yard.
士兵们在兵营练兵场操练。
The soldiers were at drill in the barrack - yard .
士兵们在兵营练兵场操练。
The soldiers were at drill in the barrack - yard .
士兵们在兵营练兵场操练。
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