Exports are declared first and then customs, imports are declared first and then customs right?

Both exports and imports, in general, is the first inspection after the customs declaration. You think about it, if I imported a number of dangerous goods, first after the customs inspection, the results of the customs clearance, in the time you just want to go to the inspection, the dangerous goods produced an adverse reaction, resulting in major injuries and deaths, you say that the procedure for doing things is not a problem. And you first declare for inspection, the Inspection and Quarantine Bureau will audit your imported things, determined that can not come in, but also on your things such as dangerous goods packaging, and so on to check before you dare to let you come in, so that the Customs get the official confirmation of the Inspection and Quarantine Bureau before your goods will be approved to enter.