“调节的”用英语怎么说？

这种椅子具有可调节的优点.The chair has the virtue of being adjustable.琴弦之间互相调节的失真已经基本上被消除了.The intermodulation distortion between the strings is virtually eliminated.你眼睛的瞳孔是自动调节的.Your eye pupil adjusts automatically....