The first two methods — upper and lower — are easy to understand.

前两个方法upper和lower很容易理解。

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The first two methods test the two desired media types, Atom and JSON.

前两种方法是测试两种所需的媒体类型 Atom 和 JSON。

youdao

The first two methods provide very good linear results in the actual process of circuit design.

在实际电路设计过程中使用前两种方法，得到了很好的线性化结果。

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Unlike earlier research, which often used video clips or other methods to simulate crimes and witnesses, the Illinois study was the first and only one to compare the two methods in the field using actual cases.

ECONOMIST: A controversy over how to handle eyewitnesses

Two methods have developed -- the first of which is piezoelectricity, used by Club Surya, where crystals in blocks under the dance-floor rub together with the assistance of dancers on the floor.

CNN: Are we heading for a human-powered future?