Must be definite in substance; Must be distinguished from an invitationtotreat.
在实质性内容方面必须明确；须与要约邀请相区别。
2
The distinction between an offer and an invitationtotreat depends on the reasonable expectations of the parties.
要约与要约邀请的区别取决于当事人的合理期待。
3
Reason, he can't refuse the perfect card shark has its own kind invitation thousands refused to rivals, and there are thousands of generous treat reason to let the opponent cannot refuse.