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它被建造的主要目的是为了保证国家免于外来入侵的威胁。
Its main purpose was to safeguard the country from external invasion.
youdao
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您的目的是向入侵者，直到您摧毁它们。
Your aim is to fire at the invaders until you destroy them.
youdao
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您的目的是向入侵者，直到您摧毁它们。
Your aim is to fire at the invaders until you destroy them.
youdao