以便他们增强实力和维护自由。
这时，鸟类非常需要新伙伴的加入，以增强实力。
Then, the birds are very need new partners, to enhance the strength.
面对新世纪的激烈竞争，图书馆增强实力的关键在于成功的管理。
Facing the intense competition in the new century, how the library to enhance its actual strength relies on the successful management.
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