基本解釋外部性同根派生 Extemalities相關(guān)詞英漢例句network extemalities and switching costs 網(wǎng)絡(luò)外型與轉(zhuǎn)換成本extemalities effects 外部性效應(yīng)extem mode 外部模式extem water 外在水分Extemalities更多例句