/ˈfrækʃən/
a small part or amount of sth 小部分；少量；一点儿
Only a small fraction of a bank’s total deposits will be withdrawn at any one time.
任何时候，一家银行的总存款只有少量会被提取。
She hesitated for the merest fraction of a second.
她略微犹豫了一下。
How_to_Use_the_Cover_Up_Method_for_Partial_Fraction_Decomposition____Case_with_2_Linear_Factors