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

前两个方法upper和lower很容易理解。

youdao

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 rely on converting your original Perl source into its compiled bytecode form and storing this precompiled version for execution.

前两种方法依赖于将原来的 Perl 源代码转换为编译好的字节码格式，并存储预编译的版本，以便以后执行。

youdao

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?