Sub-level caving is an efficient and safe mining method.

无底柱分段崩落采矿法是一种高效安全的采矿法。

youdao

Call tile map loaded in the generated site, sub-level detail display.

说明：调用瓦片图加载在生成的网站中，分级别详细显示。

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Each sub-level in this menu will be shown in its own context, making the "parent" level disappear.

在这个菜单中各子层将在其自身的上下文中显示，使得“父层”的消失。

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In July 2007, the index was ascending from a sub-10 level in November 2006.

FORBES: By Todd Salamone

It operates on a sub-regional level and involves five countries: Mauritania, Senegal, Gambia, Guinea Bissau and Cape Verde.

UNESCO: THEMES

Advocacy for a Clean Energy Policy at national and sub-national level.

FORBES: Apple Falls Down The Rankings: But We Should Praise RIM