He could add two one-digit numbers only if he used his fingers.
查尔斯仅有的数学能力便是通过手指计算两个十以内加法。
2
Her telephone number differs from mine by onedigit.
她的电话号码跟我的差一个数字。
《柯林斯英汉双解大词典》
3
One relative bright spot for Macy's during the holiday season was the online channel, where it rang up "double-digit" increases in sales and a 25% increase in the number of orders it filled.