British Rail had to post a signalman at the entrance to the tunnel.英国铁路公司不得不在隧道入口设置了一名信号员。Signalman should coordinate to ensure Safe Lifting Operation with proper signals.信号员必须确保使用正确的信号,保证起重机动作安全.British Rail had to post...
He could alternately bully and charm people.他一会儿欺负人一会儿取悦人。She became alternately angry and calm.她时而愤怒时而平静。This movie is by turn ( = alternately ) terrifying and very funny.这部电影一会儿令人毛骨悚然,一会儿滑稽可笑....