[jī lěi]
（逐漸聚集） accumulation; accumulate
have accumulated a wealth of experience
積累了豐富的經驗
accumulate first-hand data
積累第一手資料
the accumulation of knowledge
知識的積累
primitive accumulation of capital
資本的原始積累
patiently accumulate data
耐心地積累資料
[核子] build-up