2.吃点心 have a snack

1. 扔掉throw away

60.许多障碍　 many obstacles

Unit 18 some phrases

59.完成任务　 complete a task

58.保持积极的态度 keep a positive attitude

57.经常，有时　 at times

56.进行调研　 conduct a survey of

55.有同等接近……　 have equal access to

54.属于　 belong to

53.在世界范围内普遍 spread across the world