by degrees
US /baɪ dɪˈɡriːz/
UK /baɪ dɪˈɡriːz/

成语
1.
逐渐地, 慢慢地
gradually; little by little
示例:
•
The patient's health improved by degrees.
病人的健康状况逐渐好转。
•
They learned the new language by degrees.
他们逐渐学会了这门新语言。
在 Lingoland 学习这个单词

逐渐地, 慢慢地
gradually; little by little