become weak gradually 逐渐变得脆弱；
例句：
The intensity of the hydrogen bonds become weak gradually from positive ions, negative ions to dipole ions.
从正离子、负离子到偶极离子，氢键强度逐渐减小。
相关介绍
As energy is supplied to the body at a slower and slower rate, dieters gradually become so weak that they can do nothing.
由于以越来越慢的速度给身体供应能源，这些节食的人的身体就逐渐变得非常虚弱，以致弱到什么事都不能做的程度。
The past will become weak in the memory, will also gradually habit.
过去会在记忆里变淡，也会渐渐的习惯。
Apricot flower has the characteristic that become angry, when be in bud, colourful red, as petaline extend, colour by thick turn gradually weak, arrive when Xie La with respect to Cheng Xuebai one.
杏花有变色的特点，含苞待放时，朵朵艳红，随着花瓣的伸展，色彩由浓渐渐转淡，到谢落时就成雪白一片。
