Grade 9 Unit 2 Topic 3 Section D

Forests are the lungs of the earth. Without them, it cannot breathe. It needs its forests to remove ^[1]remove: US: [rɪˈmuv]  UK: [rɪˈmuːv]  v. 去除；去掉；移开；免除 carbon dioxide from the air and to make oxygen. In many countries, such as New Zealand, Canada, and Brazil, forests were cut down ^[2]cut down: 砍倒；削减；减价；夺去…活动力 to provide wood to build houses. Many young volunteers around the world are working in their holidays to plant new trees to replace ^[3]replace: US: [rɪˈpleɪs]  UK: [rɪ’pleɪs]  v. 取代；代替；更换；更新 them.

These young men and women face many difficulties when they plant new trees. The weather may be very hot and dry ^[4]dry: US: [draɪ]   UK: [draɪ]   n. 干裂；干燥(状态)；干燥场；干季   adj. 干的；干燥的；雨少的；干旱的   v. （使）变干；（把…）弄干 or it may be very cold and wet. There are often many insects ^[5]insect: US: [ˈɪnˌsekt]  UK: [ˈɪnsekt]  adj. 昆虫的；卑劣的  n. 昆虫 that bite ^[6]bite: US: [baɪt]  UK: [baɪt]  n. 咬；（咬下的）一口；少量食物；简单的一餐   v. 咬；叮；蜇；咬饵 these planters on their legs, arms, and faces while they work. They carry heavy bags of small trees, and working in the mountains can be dangerous.

Tree planters ^[7]planter: US: [ˈplæntər]  UK: [ˈplɑːntə(r)]   n. 播种机；种植园主；花盆；种植园经营者 are changing the world. They plant different types of ^[8]different types of: 不同类型的 trees so that birds and animals can live in the forests. Even though ^[9]even though: 即使；尽管 tree planting is very difficult, they love their work. They believe that in 50 years their little trees will become beautiful forests.