中文：

赎回和定赎是基金投资中两种不同的操作，它们在基金投资中有着不同的意义和作用。

赎回是指投资者在基金投资中，按照基金净值和投资者持有的份额，将持有的基金全部或部分卖出，从而获得相应的资金。赎回是一种主动操作，投资者可以根据市场情况和自己的投资目标，自主决定是否赎回。

而定赎则是一种被动操作，它是指投资者在基金投资中，按照合同约定，在一定时间内不能进行赎回操作。定赎的目的是为了限制投资者的操作行为，避免投资者过于频繁地进行买卖，从而降低市场的波动性和风险。

赎回和定赎的区别在于，赎回是投资者主动卖出基金，获得资金回报；而定赎则是投资者被动接受限制，不能进行赎回操作。此外，赎回和定赎在时间和数量上也存在差异。赎回可以在任何时间进行，数量也可以自由决定；而定赎则是在合同约定的时间内不能进行赎回操作，数量也受到限制。

在基金投资中，投资者可以根据自己的投资目标和风险承受能力等因素，选择是否进行赎回和定赎操作。通过合理配置资金和制定投资计划，投资者可以更好地规避风险，实现投资目标。

英文：

Redemption and fixed redemption are two different operations in fund investment, which have different meanings and roles.

Redemption refers to investors selling all or part of their held funds at the net value of the fund and the number of shares held by investors when investing in funds, so as to obtain corresponding funds. Redemption is a proactive operation, and investors can decide whether to redeem or not based on market conditions and their own investment goals.

Fixed redemption is a passive operation, which means that investors are restricted from performing redemption operations within a certain period of time as specified in the contract, in order to avoid investors trading too frequently and reducing market volatility and risk.

The difference between redemption and fixed redemption lies in that redemption is investors actively selling funds to obtain capital returns, while fixed redemption is investors being restricted from performing redemption operations. In addition, there are differences in time and quantity between redemption and fixed redemption. Redemption can be performed at any time, and the quantity can be freely decided, while fixed redemption restricts investors from performing redemption operations within a certain period of time, and the quantity is also restricted.

In fund investment, investors can choose whether to perform redemption and fixed redemption operations based on their own investment goals and risk tolerance factors. By reasonably allocating funds and developing investment plans, investors can better avoid risks and achieve investment goals.