由于来自英国的铅笔供应被切断，他被限制只能使用他的不纯净的法国石墨上。

Cut off from English pencils. He was stuck with his own impure French graphite.

youdao

不鲜明的，不纯净的：色彩不鲜明的和不纯净的；略显暗淡的，略显单调的。常用于合成词。

Not bright and clear in color; somewhat dull or drab. Often used in combination.

youdao

纯净的盐不会失去味道，但不纯的盐则会。

Pure salt will not lose its flavour, but impure salt will.

youdao

纯净的盐不会失去味道，但不纯的盐则会。

Pure salt will not lose its flavour, but impure salt will.

youdao