例句與造句

1. Rail systems in germany , austria , switzerland , sweden and norway all use electrical power at low frequency
   在德國，奧地利，瑞士，瑞典和挪威的鐵路系統(tǒng)都使用低頻電力。
2. It's difficult to find using electrical power in a sentence. 用using electrical power造句挺難的