done his sums
做了计算
以上为机器翻译结果，长、整句建议使用 人工翻译 。
To make their point they've put out a new poster picturing William Hague as a school boy with slogan on the lines of "He hasn't done his sums".
BBC: Tattooists and tax
应用推荐
模块上移
模块下移
不移动