fast-flowingCOCA¹⁰²⁵²⁵BNC³⁷⁰⁶⁹iWeb⁴⁵⁰³⁴Economist⁵³⁵⁸¹⁺¹ 基本例句 湍急的¹⁰⁰ Designing and building machines that can survive the harsh conditions of fast-flowing ocean waters has been challenging and the past decades have seen repeated disappointments here and abroad. 设计和兴建能在洋流湍急的恶劣条件下经受住考验的机器一直都是个难题，在过去数十年间，无论是国内还是国外，失败的例子总是屡见不鲜。 yeeyan