重點講解:
1. be composed of 組成;構成;
All animals and plants are composed of cells.
一切動植物均由細胞組成 。
2. concentrate on 全神貫注;集中(心思);
I am leaving to co ncentrate on writing fiction.
我辭職是為了專心寫小說 。
3. hail from (人或物)來自;
They hail from all parts of the country.
他們來自全國各地 。
4. be dependent on 取決(于…)的;有賴(于…)的;
Up to two million people there are dependent on food aid.
那里有多達200萬人口依靠食品援助 。
n. 植物學,植物