The rate of top grade field developing by camera bellows was up to 90%, with less poor quality and no waste photos.

暗箱在拍片现场成像优质率达90 %，质差片减少，无废片。

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The field test shows that the performance of new valve is up to grade.

经测试表明新型阀的功能和指标均达到要求。

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A new field is opened up to improve the grade of the paint used specially for internal combustion engine in our country.

为提高我国内燃机漆的档次开辟了新的领域。

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