当加法的和是一个两位数或做乘法和减法时，查尔斯便无能为力。

Sums involving two-digit numbers or multiplication or subtraction were beyond him.

youdao

当加法的和是一个两位数或做乘法和减法时，查尔斯便无能为力。

Sums involving two-digit numbers or multiplication or subtraction were beyond him.

youdao