残留率的英文：
percentage of retention
n. 百分比，百分率；比例，部分
- There is no percentage in it.
没有赚头。 - The percentage of unskilled workers is small.
非熟练工的比例很小。 - There is no percentage in arguing with him.
同他争论于事无补。 - The figures are expressed in terms of a percentage.
那些数字是以百分数表示的。 - A large percentage of the population is illiterate.
文盲人口占有相当高的比例。
n. 保留；滞留；记忆力；闭尿
- He was proud of his retentiveness.
他很自豪自己记忆力强。 - Visual material aids the retention of information.
直观材料有助于加强记忆。 - He argues strongly for retention of NATO as a guarantee of peace.
他据理力争北大西洋公约组织作为一个和平保障的保留。 - He is always worried about water retention.
他总是担心自己体内的水分潴留。 - An abnormal distention of body tissues caused by retention of air.
气肿因空气滞留而引起的体组织的不正常的扩张