Tier II equipment is also designed for the general freight system, with speeds up to 150 mph.
第二级设备也是为通用货运系统设计的，用于那些时速达到150英里（240公里）的线路。
Smith outlined an overnight air-freight system for time-sensitive shipments such as medicines, computer parts and electronics.
史密斯构想了一个通宵空运系统，运送时效性高的货物如药品、电脑和电子配件等。
Smith outlined an overnight air-freight system for time-sensitive shipments such as medicines, computer parts and electronics.
史密斯构想了一个通宵空运系统，运送时效性高的货物如药品、电脑和电子配件等。
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