| 释义 |
Police had to wait for backup to arrive before making any arrests.警方只得等待后援到来之后才进行逮捕。Airports are required to have backup from local fire brigades in case of a serious incident.机场需要有当地消防队作为后援，以防重大事件发生。The troops were engaged in a holding action until reinforcements could arrive.在后援到达之前，部队要坚持一段时间。More police officers were sent as standbys.更多警察被派了出去，以作后援。We just had to hold on until help arrived.我们只能坚持到后援到来。The officer radioed his position and help soon arrived.警官用无线电播报了自己的方位，后援很快就赶到了。 |