Time deposits are unlike demand deposits in that they are usually legally due as of a maturity date and funds cannot be transferred to another party by a written check. 定期存款不像活期存款，原因是定期存款通常有法定的到期日，资金不能在到期日之前通过签发支票的形式转移给其他人。
An option contract which gives the holder the right to buy a fixed number of shares at the stated exercise price at any time up to a fixed expiry date. 买入期权是一种期权合约，合约持有人有权于某固定的到期日前按照约定的执行价格买入约定数量的股票。
