Solid laser is a four-level system.

固体激光器是一个四能级系统。

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The tower sits atop a four-level podium that houses large banquet, meeting, dining, fitness and spa facilities.

塔楼在四层裙房内包含了大型宴会厅，会议中心，餐饮区，健身中心和SPA设施。

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In this paper, a direct instantaneous torque control (DITC) of switched reluctance motor (SRM) with a four-level converter is presented.

主要论述了基于四电平功率变换电路的开关磁阻电机直接瞬时转矩控制。

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Phase four means that a virus has gained the ability to cause community-level outbreaks.

VOA: special.2009.05.06

They now face perennial power Brazil, a four-time champion at this level, but Tetteh says he is not concerned by the formidable opponent.

VOA: standard.2009.10.15

Samsung trumpeted the much-anticipated phone's arrival Thursday at an event accompanied by a live orchestra while an audience of thousands watched the theatrics unfold on a four-level stage at Radio City Music Hall.

WSJ: Samsung refreshes iPhone-challenging Galaxy line

Sinha has made a small beginning by abolishing four secretary-level posts through a merger of federal departments.

CNN: OBSTACLES AHEAD

The Indian player beat his rival 2.5-1.5 in a tie-breaker round of four short games after they ended a 12-game series level.

BBC: Vishy Anand wins Moscow chess championship