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第50页

信息发布者：

stranger

rapidly

possibility

doubt

circles

aware

is told

won't know

have visited

to give

be handed

Because the population is increasing rapidly

aware of the importance of protecting the environment

planets with an environment similar to that of

has much thinner air than that on the Earth

because of the possibility of getting lost

you in agreement with what he said

no doubt that the film is worth watching