She twisted in her chair when I called her name.

　　我喚她的名字時，她坐在座椅上轉(zhuǎn)過身來。

　　She shifted into a more comfortable position on the chair.

　　她換了一個更舒適的姿勢坐在椅子上。

　　We wanted to buy the chairs but another couple were bidding against us.

　　我們想買下那幾把椅子，但另一對夫婦在同我們較勁出價。

　　The chairs were covered in some sort of plastic stuff.

　　椅子都包了一種塑料膜。

　　He held onto the back of the chair to stop himself from falling.

　　他扶住椅子后背，以免摔倒。