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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。
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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