| 释义 |
gray line短语¹⁴⁴⁹⁷²⁺²
基本例句
灰线
The Long Gray Line has never failed us.
西点的学子们从来没有让我们失望。 blog.sina.com.cn
But a lot of researches showed that Ni-Cr alloys exhibit low resistance to corrosion, which led to release of metal ions, hyperplastic gingivitis, gray line and hypersusceptibility.
但是越来越多的研究表明该合金具有一定腐蚀性，析出金属离子，引起牙龈增生、牙龈黑线、全身过敏等反应。 cnki |