the ability to change or be changed easily according to the situation

The advantage of this system is its flexibility. 这个系统的优势在于其灵活性。

The schedule doesn't allow much flexibility. 时间表不允许有太大的灵活性。

the ability to bend or to be bent easily without breaking

You can improve your flexibility by exercising. 您可以通过锻炼来提高身体的灵活性。

Plastic is more suitable because of its flexibility. 塑料更适合，因为它具有柔韧性。