Sometimes they are forced to skirt the concrete machine gun emplacements of Iranian border guards, at others they have to wade across freezing mountain streams or negotiate sheer precipices.

有时，他们被迫绕过伊朗边防军的混凝土机枪阵地，有时，他们不得不趟过寒冷的山涧溪流或绕过峻峭的悬崖。

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It is proved by a concrete example of gun barrel strength design with consistent reliability that a consistent reliability will offer a consistent safety abundance.

针对某型火炮身管进行了可靠度有限一致的强度设计，从而保证了身管设计安全裕度的有限一致。

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In the wake of the shooting in Newtown, Connecticut, President Obama has vowed to push for immediate and concrete gun safety proposals.

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President Barack Obama has set a January deadline for "concrete proposals" to deal with gun violence after the Newtown shooting.

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The cell is a small, windowless room painted a nondescript beige, with a gun-metal gray floor and concrete sleeping platform.

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