素指用英语怎么写
英文写法翻译
Prime finger
重点词汇
素指───Prime finger
双语使用场景
you're at the front of C prime, your thumb points to the right, your index points up because that's where the surface is, and then your middle finger will point out.───你在曲线C的前端,你的拇指指向右边,你给指出来了,因为那就是这个表面所在,然后你的中指就会指出。