求翻译：外壳阻燃试验: 充电器外壳应具有很好的阻燃效果。使用明火对充电器的塑料外壳进行可燃性试验，离开火焰后，外壳燃烧的火焰应能在1分钟内自行熄灭。是什么意思？

Flame test case: charger housing should have good flame-retardant effect. Use of fire on the charger's plastic housing for flammability test, leave the flame, the flame burning shell should be able to self-extinguish within 1 minute.

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Outer covering being flame-resistant experiment: The battery charger outer covering should have the very good being flame-resistant effect.The use open fire carries on the flammability test to the battery charger plastic outer covering, after leaves the flame, the outer covering burning flame ought

Shell fire retardant test: Chargers shell should have a good flame retarding effect. Flammability test using the open fires on plastic casing of the charger, after leaving the flame, combustion flame shell should be able to go off on their own in 1 minute.