1.After all security is of top priority. No one can assure if some criminal are ambushing in the hotel to make some illegal transaction.
没人能确保是不是有犯罪分子潜伏在酒店进行一些非法交易。
2.consensual , Involving the willing participation of both or all parties, especially in an illegal transaction or practice:
自愿参与的，双方或所有各方都自愿参与的，尤指在非法交易或行为中：
3.The an anti-illegal transaction system 100 for preventing illegal transaction includes: mobile phone 190 used in transaction by user;
该用于防止非法交易的非法交易防止系统（100）包括：利用者在交易中使用的移动电话（190）；