“非当事人所能控制,而且没有理由预期他在订立合同时所能考虑到或能避免或克服它或它的后果而使其不履行合同义务的障碍.”

The non- litigant can control, moreover does not have the reason to anticipate he when let a contract can consider to either can avoid or overcome it or its consequence but causes it not to fulfill the contract duty the barrier.
或者?
Non-party control, but there is no reason to expect he can be taken into account in the formation of contracts or to avoid or overcome it or its consequences to non-compliance with contractual obligations obstacles .
我也感觉不到哪个好~哈哈~