词汇讲解：
1. portable adj. 便于携带的; 手提式的; 轻便的
例句：I have a portable typewriter.
我有一个便携式打字机。
2. transfer vt. 搬;转换;调动
例句：She has been transferred to another department.
她已被调往另一部门。
3. harness vt.给(马等)装上挽具；治理, 利用
例句：They will harness the sun's energy to heat homes.
他们将利用太阳能为住宅供暖。
4. store vt. 储藏; 存放
例句：Water is stored against the dry season.
蓄水以备旱季使用。
5. plug v. 插上插头
例句：The girl let her mother plug in the TV set.
女孩叫母亲插上电视机的插头。
6. beneficial adj. 有益的, 有利的
例句：I hope your holiday will be beneficial to you.
我希望你的假期会对你有益。
7. power vt. 用发动机发动；给…提供动力
例句：The aircraft is powered by three jet engines.
这架飞机由三台喷气发动机驱动。
8. shortage n. 缺少,不足,匮乏
例句：There is a shortage of salt in this country.
这个国家缺少盐。
9. alternative n. 供选择的东西(或办法等)
例句：What alternatives are there?
还有什么可选择的?
10. shine vi. 发光;照耀
例句：The sun shone bright and warm.
阳光灿烂和煦。
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