from which引导什么从句

　　We will now consider the raw materials from which the body derives energy.

　　现在我们来细想一下为身体提供能量的原料。

　　I realized I'd let myself in for something from which there was no turning back.

　　我意识到自己陷入了没有退路的境地。

　　This was when he evolved the working method from which he has never departed.

　　就在这个时候，他逐步形成了那种他一直沿用至今的工作方法。

　　I think the decision was a bitter blow from which he never quite recovered

　　我想这个决定对他是个沉重的打击，从此以后他一蹶不振。

　　The resin from which the oil is extracted comes from a small, tough tree.

　　用于提取这种油的树脂取自于一种矮小坚韧的树。