中文：

投资风险是指在投资过程中可能出现的各种不确定因素和风险，这些风险可能导致投资者遭受损失或收益波动。投资风险是投资决策的重要组成部分，对于投资者来说，了解和评估投资风险是非常重要的。

投资风险包括市场风险、信用风险、流动性风险、操作风险等。市场风险是指市场价格波动导致的风险，如股票价格下跌或商品价格波动等。信用风险是指借款方违约或破产导致的风险，如债券违约等。流动性风险是指资产难以迅速出售或变现的风险，如某些股票或房地产等。操作风险是指由于内部流程、人为错误或系统故障导致的风险，如交易错误或欺诈等。

评估投资风险的方法包括定量分析和定性分析。定量分析可以通过历史数据、统计模型等手段来预测未来市场价格、利率等变量的变化，从而评估投资风险。定性分析可以通过分析市场趋势、政策变化等因素来评估投资风险。

在投资决策中，投资者应该充分了解投资产品的特点和风险，并根据自身的风险承受能力和投资目标来选择合适的投资产品。同时，投资者应该制定相应的风险管理措施，如分散投资、限制杠杆等，以降低投资风险的影响。

英文：

Investment risk refers to the various uncertain factors and risks that may arise during the investment process, which may cause investors to suffer losses or fluctuations in returns. Investment risk is an important part of investment decision-making, and it is very important for investors to understand and assess investment risks.

Investment risks include market risks, credit risks, liquidity risks, operational risks, etc. Market risks refer to risks caused by market price fluctuations, such as stock price decreases or commodity price fluctuations. Credit risks refer to risks caused by borrower default or bankruptcy, such as bond defaults. Liquidity risks refer to the risk that assets cannot be sold or liquidated quickly, such as certain stocks or real estate. Operational risks refer to risks caused by internal processes, human errors, or system failures, such as trading errors or fraud.

Assessing investment risks can be done through quantitative and qualitative analysis. Quantitative analysis can predict future changes in market prices, interest rates and other variables through historical data and statistical models to assess investment risks. Qualitative analysis can assess investment risks through analyzing market trends, policy changes, etc.

In investment decisions, investors should fully understand the characteristics and risks of investment products and choose appropriate investment products based on their risk tolerance and investment goals. At the same time, investors should develop corresponding risk management measures such as diversification of investments and limiting leverage to reduce the impact of investment risks.