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Mid-Autumn Festival is held on the 15th of the 8th lunar month in the Chinese calendar, within half a lunar month of the autumn equinox (from about Sep. 6 to Oct. 6). On the Chinese lunar calendar, the 8th month is the middle month of autumn and the 15th is its middle day.
Nowadays, electronic components are developing towards miniaturization, and packaging is also gradually developing towards cheapening. General electronic components are plastic package. However, the disadvantage of plastic packaging is that the moist gas will enter the interior of the device through the packaging material and the joint surface of the components, which will cause the internal circuit to oxidize, corrode, and short-circuit on the one hand.