An emergency call was received shortly before the plane went down.坠机前不久收到过紧急呼救。A ship answering this SOS call arrived in time.一艘应这一紧急呼救信号而来的船只及时赶到。No SOS messages were received from the plane.没有收到从飞机上发出的紧急呼救信号。The ferry did not even have time to send out an SOS.渡船甚至连发出紧急呼救信号的时间都没有。