To safeguard against RF and EM interference from external and internal sources, PowerLine 300 features a unique double shield plus a double-molded termination.是什么意思_To safeguard against RF and EM interference from external and internal sources, PowerLine 300 features a unique double shield plus a double-molded termination.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句