而优质膜选用光学级聚酯膜。

The quality of film selection of optical grade polyester film.

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第六学级学院在1962年还是新提法。

The very idea of a sixth form college was novel in 1962.

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乔治把自己的学级戒指送给简，表示她是属他的。

George staked a claim on Jane by giving her his class ring.

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研究设计：随机对照研究； 循证医学级别，1级。

Study Design: Randomized, controlled trial; Level of evidence, 1.

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研究设计：随机对照研究； 循证医学级别，1级。

Study Design: Randomized, controlled trial; Level of evidence, 1.

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