Slow speed is the chief drawback of sea shipment.
海运最大的缺点是速度慢。
M: The order is so urgently required that we have to ask you to speed up shipment.
m:由于定单很急,所以我们必须要求你们加快发货。
The order No. 105 is urgently required so we have to ask you to speed up shipment.
第105号订单所订货物我们要急用,请你们加快出货速度。