17. conifer
/ˈkɑːnɪfər/
a tree such as a pine or fir that has leaves like needles and produces brown cones that contain seeds. Most types of conifer keep their leaves in winter
针叶树
18. glade = clearing
/ɡleɪd/
a small open space in a wood or forest
林间空地
19. tributary
/ˈtrɪbjəteri/
a stream or river that flows into a larger river
（河流的）支流
20. river
/ˈrɪvər/
a natural and continuous flow of water in a long line across a country into the sea
the Amazon River
亚马逊河
21. meander
/miˈændər/
a large bend in a river
河曲；河湾
22. pass
/pæs/
a high road or path that goes between mountains to the other side
山口；关口；关隘；山路
