A piece of writing giving instructions has much in common with the explanation of a process,【36】it is addressed to a different reader and【37】a different purpose. The reader is someone who may be expected to【38】the process, and the purpose is to enable【39】to perform. it properly rather than【40】to understand it. In one sense of the world,【41】seem to mean the same thing【42】orders but there is a difference between ordering a person to【43】something and telling him【44】to do something. The two possibilities are not mutually (相互地) exclusive, and【45】may be called for on some occasions.【46】our context, however, giving instructions means giving【47】rather than giving orders,【48】such information may sometimes be expressed in the imperative (命令地)【49】. In technical writing【50】instructions is usually a【51】of telling how to perform. some physical process such as assembling, using, inspecting,【52】repairing equipment, performing a test, or doing some job in a laboratory. Such instructions are given【53】manufacturers to dealers (商人) who sell and service their products and to consumers who use them they【54】the bulk of the contents of laboratory manuals they are produced, in the form. of instruction manuals, as a result of【55】labor, by the multimillion-dollar industries that serve the armed forces. (61)