I half expected the American to pick up the spare machine pistol and mount guard over the operation.我有点盼望那个美国人能拿起闲着的冲锋枪保卫此次行动。Armed security officers are employed to mount guard over the president.雇用武装保安人员来保护总统。They've even mounted guard outside the main hotel in the capital.他们甚至派人在首都的大饭店外面站岗。