The competition in their personal mapping equipment operating skills, four leveling, traversing the contents of such skills as the main competition.

本次大赛以个人测绘仪器操作技能、四等水准测量、导线测量等技能为主要竞赛内容。

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Leveling jacks, located at the four corners of the main frame, are controlled from the operator's cab.

位于主机架四角的调平千斤顶是从操作室控制的。

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Although heart disease death rates have been falling in the U. S. for four decades, they are now leveling off for young men and women.

虽然美国心脏病死亡率四十年来一直下降，但是年轻男性和女性的心脏病死亡率的下降趋势正在慢慢停下来。

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Although heart disease death rates have been falling in the U. S. for four decades, they are now leveling off for young men and women.

虽然美国心脏病死亡率四十年来一直下降，但是年轻男性和女性的心脏病死亡率的下降趋势正在慢慢停下来。

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