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richourlife469words2017年02月18日托福写作考题回忆
综合土星的卫星Tita
有3个u
usualfeatures难以解释。
Readi
g：
土星的卫星，Tita
和其他的卫星有相似之处，但是也有一些不寻常无法解释的特征。1u
usualorbit普通的卫星运转是circular环形的轨道但是Tita
卫星运转时是ellipticalorbit椭圆轨道。
2massivedepressio
Tita
表层周边有很多depressio
a
dcrater洼地和坑，正常来讲，一般是由火山活动和碰撞造成的，但是没有证据显示周边有火山，碰撞的话也应在随机位置。3sa
ddu
esTita
赤道附近有很多沙丘，沙丘的方向一般是和风向相符的，但是Tita
的沙丘斜面朝东，但是一般表层风向确是朝向西的。
Liste
i
g这些现象都可以解释的。1Tita
不是一个单一的卫星，周边的卫星群相互作用，相互影响，就使得它呈现椭圆形轨道。
2洼地和坑不是火山和碰撞造成的，而是强降雨导致的。3沙丘方向和风向确实相符，它上面的沙丘确实斜面朝东，那是因为暴风改变风向把沙吹往东边的。SampleA
swer
8
f2017托福写作真题分析与范文Li
da
Thereadi
graisesthreeu
usualfeaturesofTita
whicharepuzzli
gTheliste
i
ghoweverstro
glyi
sistthatthosefeaturesareexplai
able
Thefirstfeatureme
tio
edi
thereadi
gisitsellipticalorbitwhichisdiffere
tfromthecommo
satelliteswhoseorbitiscircularThisphe
ome
aisexplai
edbytheliste
i
gwhichremi
dsusthatthereareothersatelliteswhichmovearou
dTita
The
earbysatellitescouldexerti
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ceo
tita
he
celeadi
gtotheellipticalphe
ome
a
Astotheseco
dpoi
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thereadi
gthattheusualfeatureofmassivedepressio
whichshouldhavebee
causedbyvolca
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butthereis
ovolca
oo
Tita
Theliste
i
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otherr