常見(jiàn)例句雙語(yǔ)例句In a helicopter the articulated head and tail rotor gearbox are required to be a very high specification design using the best materials and requiring frequent and costly maintenance.在直升機(jī)的闡述頭和尾槳變速箱都必須是一個(gè)非常高規(guī)格的設(shè)計(jì)使用最好的材料和需要頻繁和昂貴的維修。www.tech-domain.com 返回 gearbox head