unstable quality 质量不稳定
But this workshop will make the product's quality unstable because of different production environments and different regions.
可是这样的作坊式生产，产品品质会因生产环境，地区不同而不够稳定。
The chemicals in a Bloody Mary are 'highly unstable' - and its quality tends to deteriorate quickly because of the acids in the tomato juice, he said.
他说道，血腥玛丽内的化学物质属于“高度不稳定型”，而且因为西红柿汁中存在着酸性物质，这种酒很容易变质。
If the product is unstable, and many defects are being discovered and investigated, you'll need to add test cycles until the quality criteria are met.
如果产品不够稳定，发现了很多缺陷，那么你需要增加测试的周期直到达到质量标准。
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