Franzen is here to look at birds: he's a bird watcher.

弗兰岑在这里赏鸟：他是一个看鸟的人。

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But observations that an amateur bird-watcher can make are really limitless.

但是一个业余观鸟者所能做的观察是无限的。

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Observations that an amateur bird-watcher can make are really limitless.

业余观鸟者的观察力是无限的。

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Observations that an amateur bird-watcher can make are really limitless.

业余观鸟者的观察力是无限的。

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