Gharib and graff set themselves the task of raising a 4.5-meter stone column from horizontal to vertical, using no source of energy except the wind.
加里卜与格拉芙制定了一项任务:仅利用风能,将一个水平放置的4.5米高石柱提至与地面垂直。
"I don know," said graff.
“我不知道,”格拉夫说。
"I don know," said graff very simply.
“我不知道,”格拉夫的回答很简单。