【答案解析】Indorsement is a signature, must be the same with the transferor's name as stated in the bill in order to operate as a negotiation, must comply with the following conditions, namely: (1) it must be written on the bill itself and signed by the indorser, the simple signature of the indorser on the bill without additional words, is sufficient; (2) it must be an indorsement of the entire bill. There are four types of indorsement: (i) a blank indorsement, which, no transferee is specified; (ii) a special indorsement, which spells out the name of transferee; (iii) a restrictive indorsement, which will prevent further negotiation of the bill; (iv) a conditional indorsement, which transfers ownership subject to a specified term or condition.