中文：

人民币对外升值的原因主要有以下几点：

一、中国经济持续快速发展。中国的经济实力越来越强，国际地位越来越高，人民币在国际市场上的需求量也越来越大，这是人民币对外升值的最主要原因。

二、美元汇率波动。美元汇率波动是影响人民币对外升值的重要因素之一。由于美元是国际货币，其汇率波动会对全球货币体系产生影响，从而影响人民币对外升值。

三、国际贸易顺差。中国长期以来一直是国际贸易顺差的国家，这使得人民币在海外市场上的需求量增加，从而促使人民币对外升值。

四、国际投资流入。随着中国市场的逐步开放，越来越多的国际资本流入中国市场，这使得人民币的供应量增加，从而促使人民币对外升值。

总之，人民币对外升值的原因是多方面的，其中包括中国经济持续快速发展、美元汇率波动、国际贸易顺差和国际投资流入等因素。这些因素相互作用，共同推动着人民币对外升值。

英文：

The main reasons for the appreciation of the Chinese currency against foreign currencies are as follows:

First, the sustained and rapid development of the Chinese economy. China's economic strength has been increasing, and its international status has been rising. The demand for the Chinese currency in the international market has also been increasing, which is the main reason for the appreciation of the Chinese currency against foreign currencies.

Second, the fluctuation of the US dollar exchange rate. The fluctuation of the US dollar exchange rate is one of the important factors affecting the appreciation of the Chinese currency against foreign currencies. As the international currency, the fluctuation of the US dollar exchange rate will affect the global currency system, thus affecting the appreciation of the Chinese currency against foreign currencies.

Third, the trade surplus. China has long been a country with a trade surplus, which increases the demand for the Chinese currency in the overseas market, thus promoting the appreciation of the Chinese currency against foreign currencies.

Fourth, the inflow of international investment. With the gradual opening up of the Chinese market, more and more international capital flows into the Chinese market, which increases the supply of the Chinese currency and thus promotes the appreciation of the Chinese currency against foreign currencies.

In general, there are many reasons for the appreciation of the Chinese currency against foreign currencies, including the sustained and rapid development of the Chinese economy, the fluctuation of the US dollar exchange rate, the trade surplus, and the inflow of international investment. These factors interact with each other and jointly promote the appreciation of the Chinese currency against foreign currencies.