betray背叛, campus, casualty意外事故,上网人员
compulsory, conjunction, curl ,
detain拘留,留住,耽搁
, disappear, drawback ,economic , extinguish熄灭,压制
, harsh严厉,严酷,刺耳,粗糙 , housing,外壳,外罩 precious , prototype原型,模范 ,
spacious宽广,广阔 symmetry,对称,整齐,均匀
temperament气质,性情,性格,气躁, undergo经历,忍受,
wander
A variety of activities
成年人应该组织多样化的活动 should be organized so that participants(指小孩) can remain active as long as they want
想活动多久就活动多久and then go on to something else
不想待在这个活动了,他们可以去其它活动 without feeling guilty
不用感到内疚 and without letting the other participants down .
也不会让其他人失望
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