英语语法分析

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't know," said Graff.

“我不知道，”格拉夫说。

"I don't know," said Graff very simply.

“我不知道，”格拉夫的回答很简单。