Containerization of such goods facilitates efficient mechanized handling of the cargo, and thus saves time and money, and also reduces pilferage(偷盗). Shipping ________ come in two lengths, 20 feet and 40 feet. A 20’ container carries up to approximately 28 tons of cargo with a volume of up to 1000 cubic feet. Most containers are metal boxes with an 8×8 cross-section(横断面), but other varieties exist, such as: refrigerated containers, open top, open side, and half height. In addition there are containers of nonstandard sizes. Large containerships can carry thousands of 20 feet Equivalent Units (________ ), where a 40’ container is counted as two TEUs.