英语：词汇及解析：enter

　　15. ◎ energetic a. 精力旺盛的，精力充沛的 energetically adv.

　　energy n. 精力 be full of energy

　　16. enough n 足够 adj足够的/充分的 ad足够地/充分地

　　I can’t thank you enough.=I can’t thank you too much. old enough to go to school

　　There are enough chairs for the guests.

　　17. enter vt进入 ,参加 entrance 入口，入学 enter a room enter for …报名参加…

　　enter the competition the entrance to the hall

　　the college entrance exanimation 大学入学考试

　　18. ◎ enthusiastic a. 热情的，热心的 enthusiastically adv. be enthusiastic about

　　19. ●entry 进入 Countries seeking entry into the European Union.

　　20. ◎environment n. 环境 protect the environment environmentally friendly