gōng chéng shī / bǎ / diàn lù bǎn / yòng / shù zhī / fēng zhuāng / qǐ lái / fáng zhǐ / shòu cháo

工程师把电路板用树脂封装起来，防止受潮。

The engineer sealed the circuit board with resin to protect it from moisture.