Each crawler provides independent, infinitely variable control and counter rotation capability.

每个履带都提供独立、无限可变的控制和反向旋转能力。

And while psychologists have defined about 10 basic emotions, moods tend to fall into two broadly and infinitely variable categories.

虽然心理学家已经定义了大约 10 种基本情绪，但情绪往往分为两个范围广泛且变化无穷的类别。