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1.Erect: in an upright position straight 垂直的;豎直的;直立的
Stand with your arms by your side and your head erect. 手放兩邊，昂首站立。
2.Swing: to move backwards or forwards or from side to side while hanging from a fixed point; to make something do this (使)擺動,搖擺,搖蕩
His arms swung as he walked. 他邊走邊擺著雙臂。 V
A set of keys swung from her belt. 她腰帶上掛著的一串鑰匙擺來擺去。
As he pushed her, she swung higher and higher(= while sitting on a swing). 隨著他推她，她在秋千上越蕩越高。
He sat on the stool, swinging his legs. 他坐在凳子上晃動著兩條腿。
3.Elasticity: the quality that something has of being able to stretch and return to its original size and shape (= of being elastic) 彈性;彈力
4.Bent: not straight 彎曲的
a piece of bent wire 一段彎曲的金屬絲
Do this exercise with your knees bent(= not with your legs straight). 這個動作要求雙膝彎曲。
5.Stiff: firm and difficult to bend or move 不易彎曲(或活動)的;硬的;挺的
stiff cardboard 硬紙板
a stiff brush 硬刷子
The windows were stiff and she couldn't get them open. 窗戶緊，她開不開。
I've got a stiff neck. 我脖子發僵。
