2. expand: to become greater in size, number or importance; (of a business) new branches are opened so that it can earn more money; to add details

教材原句：Dr. Yuan searched for a way to increase rice harvests without expanding the area of fields. (P10)

观察：1）If water is heated, it will expand.

　　　2）He expanded his short story into a novel.

　　　3）The professor expanded on the topic.

发现：【归纳拓展】expand既可以是vt.也可以是_______。expand... _______ 使扩大，变大；expand on/upon ______________。n. 扩张；膨胀；扩大；发展______________；adj. 扩张性的；豁达的；广阔的______________。

【语境活用】用expand的正确形式填空，并且英译汉。

①The group has __________ into Germany .

②We plan to __________ the pub by adding a family room.

③He has become a confident, __________man again.

④Despite the economic crisis, the company is confident of further __________.

3. therefore: as a result of that adv.因此；所以

教材原句： He therefore gives millions of yuan to equip others for their research in agriculture.

观察：1）We do not have enough money. Therefore, we cannot afford to buy the new car.

　　　2）He is only 17 and therefore not able to vote.

　　　3）He was the only candidate; therefore, he was elected.

发现：【归纳拓展】注意 therefore 在句子中的位置。therefore 是副词，不能引导从句，两个句子之间要用连词或者分号；而 so是连词，可接从句。

【语境活用】

①He was very tired and __________ he fell sound asleep. ＝He was very tired. __________ he fell sound asleep. ＝He was very tired, __________ he fell sound asleep. ＝ He was very tired; __________ he fell sound asleep.

4. equip: to provide sb. with the things that are needed for a particular purpose

教材原句： He therefore gives millions of yuan to equip others for their research in agriculture.

观察：1）A good education should equip you for life.

2）Our classroom is equipped with a TV set and a tape recorder.