Safety comes first for science lab class.

安全是科学实验课的第一要务。

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Computation results show that reliability index of gate component strengths conforms with safety standards of the first class structure.

计算结果表明，闸门构件强度可靠指标基本满足一级建筑物安全水准。

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The design safety rank of the slope is second to first class.

设计边坡安全等级为二级至一级。

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Private First Class Svehla, utterly disregarding his own safety, destroyed enemy positions and inflicted heavy casualties, when suddenly, fragments from a mortar round exploding nearby seriously wounded him in the face.

WHITEHOUSE: President Obama Awards Medal of Honor to Korean War Heroes

Myriad features come standard, with even more on the options list, including a first-class Meridian audio system and all the latest high-tech safety systems.

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Realizing the success of mission and the safety of the remaining troops were in peril, Private First Class Svehla leapt to his feet and charged the enemy positions, firing his weapon and throwing grenades as he advanced.

WHITEHOUSE: President Obama Awards Medal of Honor to Korean War Heroes