逐渐增加用英语怎么说？

逐渐增加

例句

• When China began to implement market overhauls in the 1980 s , group of engineers gained influence. 自从上世纪八十年代中国开始实行市场经济以来, 一批工程专家的影响力也逐渐增加.
• And China will come under increasing pressure to revalue the yuan. 而中国面临逐渐增加的重新估值(值)力.
• Chyme pH in crop, proventriculus and gizzard increase gradually with age. 结果表明, 嗉囊、腺胃和肌胃内食糜pH随 日龄逐渐增加,而小肠内食糜pH随 日龄变化不大.