The country's economy was already in a tailspin before the invasion.在入侵之前该国经济已经直线跌落。Military activity was secretly taking place for weeks before the invasion.入侵之前已秘密进行了几个星期的军事活动。The ancient Britons inhabited these parts of England before the Roman invasion.在古罗马人入侵之前，古英国人居住在英格兰的这些地区。