the limbs四肢
1. arm
Every person has two arms: the right arm and the left arm. The right arm is usually stronger, so we call a good helper the right arm.
We all know an arm is not vry long. But when yhou keep someone at arm’s length, the distance is long enough. For that means you do not like that person and you try your best to avoid him or her. We should indeed keep the bad friends at arm’s length.
手臂
每個人都有兩雙手臂；左臂和右臂，而右臂通常較強壯，因此，我們常以right arm”來稱得力的助手。
我們都曉得，手臂是相當短的，不過，當你和別人保持“一臂之距(keep somebody)at arm’s length)時，卻不是很短的了。因為那意味著你不喜歡那個人而且避免和他（或她）親近。我們對那些損友，確實是應該保持距離的。
2. elbow
Once in a while you sit with your head in your hands and both elbows on the table, don’t you/ You may use your elbows again when you want to go through a big crowd. Then you have to elbow your way through it .
The word also refers to the part of the sleeve of a coat which covrs the elbow. A poor man usually wears old, ragged clothes, and in both elbows of the sleeves, you may even see holes. So, to desctibe a poor man wearing shabby colthes, you can say that he looks out at elbows.
肘
你偶爾雙手抱頭，肘就擱在桌上，是不是？當你要穿過擁擠的人群時，你也會用得著雙肘，那時你就得擠過去(to elbow your way through it ).
這個也可以指衣袖蓋肘的部分。窮人通常穿破舊衣服，你在他的衣袖雙肘部位甚至可能見到破洞。所以，在描述一個穿著舊衣服的窮人時，你可以說he looks out at elbows.(他衣衫襤褸，顯得很寒酸。)
