tractable

这种金属非常柔软，容易塑形。

This metal is very ___tractable, so it's easy to shape.

这只小狗非常听话，训练起来很容易。

The puppy is very ___tractable and easy to train.

这个乖巧的幼儿园孩子安静地听完了整节课。

The ___tractable kindergartner sat quietly through the entire lesson.