没有新鲜空气或温暖阳光加强它们自然的抵抗力。
There is no fresh air or sunlight to bolster their natural powers of resistance.
如果你限制了他们行动的自由性，那么，自然而然的也就使他们的攻击力和抵抗力下降了。
And if you reduce their freedom of movement, that naturally reduces their appetite to stand and fight.
俄罗斯邮政部门表示：“造成邮件丢失的具体原因通常是某些由外部环境带来的不可抗力，诸如自然灾害、交通及其他方面的意外事故等。”
"The loss of mail usually happens because of force majeure circumstances, such as natural disasters, traffic and other accidents," Russian Post told Reuters via E-mail.
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