一个有用的工具。
It's a useful gadget for loosening bottle LIDS.
这是一个很实用的用来松动瓶盖的小工具。
A corkscrew is a very useful gadget for opening bottles of wine.
这是一物多用，既是瓶塞钻，又是开瓶器。
A corkscrew is a very useful gadget for opening bottles of wine.
瓶塞钻是很好用的开酒瓶工具。
It can take a lot of work and a significant amount of knowledge to make a useful electronic gadget.
制作一个电子物件需要做很多工作和大量的知识。
Because of the stability of LED current, these designs provide an expanded input-ac-voltage range, which may be useful for a multistandard ac-powered gadget;
由于LED电流的稳定性，这些设计使输入交流电压的范围扩大，其有利于多标准交流供电设计；
Because of the stability of LED current, these designs provide an expanded input-ac-voltage range, which may be useful for a multistandard ac-powered gadget;
由于LED电流的稳定性，这些设计使输入交流电压的范围扩大，其有利于多标准交流供电设计；
应用推荐