VOA慢速英语:Teaching Coffee Farmers About the Birds and the Bees

learn about 了解
例句：Childrenseem to learn about computers by osmosis. 
儿童似乎不知不觉地就了解了计算机. 

2. Most coffee farms in Costa Rica have one or two different kindsof trees to help shade the coffee plants from the sun.

kinds of 有点儿
例句：She looks kind of pale after her illness.
她病后面色有点苍白。

3. In Finca la Bella most farms have at least twenty kinds oftrees.

at least 至少
例句：He smoked at least half a packet of cigarettes a day.
他每天至少抽半包烟。

4. If farmers have at least ten different kinds of trees perhectare, they may be able to have their coffee certified as "bird-friendly."

be able to 能够
例句：I admire the way she is able to shrug off unfair criticism. 
我很佩服她能对错误的批评意见不予理会。 

5. This is done by the Smithsonian Migratory Bird Center in theUnited States. Bird-friendly coffee can sell for a higher price.

sell for 出售
例句：Can you sell for us on a commission basis? 
你能拿佣金替我们销售吗？ 

6. But then our students can also help provide them with ideas andrecommendations about how to improve their tour.

provide with 供给;为...装备上
例句：The ship was provided with radar equipment.
那船装有雷达设备。