The Life Expectancy of the Marine Engine. The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions.
In common usage, export means to send something from your country to a different country, and import means to bring something from a foreign land to your own. Similarly, in computer terminology, import means to bring a file from a different program into the one you're using, and export means to save a file in a way that a different program can use it. Importing and exporting allow different computer programs to read each others' files.
Trade, in general connotation, means the purchase and sales of commodities. In International Trade, purchase and sale are replaced by imports and exports. Balance of Trade is simply the difference between the value of exports and value of imports. Thus, the Balance of Trade denotes the differences of imports and exports of a merchandise of a country during the course of year. It indicates the value of exports and imports of the country in question.