See the middle layer of transparent film, obviously within reach, but cannot reach.
看到中间那层透明的膜，明明触手可及，却无法抵达。
The middle layer is the platform.
中间层是平台。
The middle layer is for tests that fall between the two extremes.
中间层是处于这两个极端中间的测试类型。
The middle layer is for tests that fall between the two extremes.
中间层是处于这两个极端中间的测试类型。
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