求翻译：从事跨国经营的公司在经营时会用到多种货币，因此外汇交易成本是影响其有效现金管理的一个重要因素。对于拥有国外子公司的跨国公司，由于每个子公司都可能在某些币种上出现盈余或发生短缺，其现金管理就更为复杂。是什么意思？

Companies engaged in multinational operations will be used when operating a variety of currencies, foreign exchange transaction costs is an important factor to affect the effective cash management. For multinational companies with foreign subsidiaries, each subsidiary may have a surplus in certain c

engaged in transnational companies operating in the business, will be used in a variety of currency, foreign exchange