To work on individualskills, we especially like to use the squaredrill, which we can practice inalmost any indoor area with space.
为了提高个人技能，我们特别喜欢使用方阵训练，我们可以在几乎任何室内空间进行练习。
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In the region surrounding the densely populated city of Hanoi — with nearly 2,000 people per square kilometre — it is difficult to escape arsenic-contaminated water, no matter how deeply you drill.
In the region surrounding the densely populated city of Hanoi — with nearly 2, 000 people per square kilometre — it is difficult to escape arsenic-contaminated water, no matter how deeply you drill.