渐变的英文：
gradual change

参考例句：

Impedance taper
渐变式阻抗变换器

GI(Grated Index)
渐变折射线(光纤)

A gun with a narrowed bore near the muzzle.
绞筒枪一种有向枪口逐渐变窄的枪膛的枪。

This cline exists along a transect from the Sacramento Valley to near the crest of the Sierra Nevada Mountains
这一渐变群是沿着萨克拉曼多谷地到西瓦内华达山脊的植被带存在的。

Lapse into idleness
渐渐变懒

The road pinched down to a trail.
"大路渐渐变窄,成了羊肠小道。"

The fruit that was laid out has dried out.
放在外面的水果逐渐变干。

Boundaries between oil, gas, and water may be sharp or transitional.
油、气、水的边界可能是突变的，也可能是渐变的。

Continuous tone: A image in which tonal gradation is produced by gradually changes of density.
连续色调:由渐变密度构成的不同色调层次的图像。

The seaward margins of these benches are transitional and cannot be defined as easily as the landward margins
这些砂阶的向海一边是渐变的，而且不如向陆一侧那样易于确定。

gradual是什么意思：
adj. 渐渐的；平缓的

But that climb will be gradual.
但是，这个攀升将是平缓的。

The muddy river cleared gradually.
污浊的河流渐渐变清了。

To gain entrance gradually or surreptitiously.
渗透逐渐地或秘密地获得进入权

The sea is gradually encroaching on the land.
海水渐渐地侵蚀了陆地。

But gradually his fear diminished.
后来他的惶恐渐渐地减少了。

change是什么意思：
n. 变化；交换，交替；零钱
v. 改变；交换，替换；兑换；更换

change a bed;change the baby.
换床单；给婴儿换尿布

We propose 'a change [making a change / to make a change / that a change should be made].
我们建议应做一点改变。

The change of quantity can causes the change of quality.
量变可以引发质变。

Changing the rate of cylinder rotation changes the speed selected.
改变圆筒旋转速率就改变被筛选的速率。

Inflammatory changes appear secondary to biochemical changes
炎症变化似乎是继发于生物化学的变化。