科学家通过观察树木年轮的条纹来研究气候变化。

Scientists study climate change by observing the ___banding in tree rings.

医院使用分组系统，根据患者的年龄和症状进行分类治疗。

The hospital uses ___banding to group patients by age and symptoms for treatment.

医生建议用橡皮圈结扎术来治疗他的痔疮问题。

The doctor recommended ___banding to treat his hemorrhoid problem.