中文：

投资风险的本质是什么？这是每一个投资者都需要深入思考的问题。投资风险是指投资者在投资过程中面临的各种不确定性和可能带来的损失。这种风险不仅存在于股票、基金等金融领域，还存在于房地产、实业等各个领域。

投资风险的本质可以理解为以下几点：

首先，投资风险是一种不确定性。这种不确定性可能来自于市场波动、经济环境变化、政策调整等多个方面。投资者在进行投资决策时，需要对这些不确定性进行评估和预测，但这种预测往往存在误差，从而导致投资风险的存在。

其次，投资风险与投资者的主观因素有关。投资者的投资目标、风险偏好、投资期限等因素都会影响其投资决策，而这些因素往往难以准确预测和掌控，因此也增加了投资风险的可能性。

最后，投资风险具有可预见性和不可预见性。投资者可以通过对市场和政策的研究和分析，对一些风险进行预见和规避。但是，有些风险是难以预见的，例如突发事件、黑天鹅事件等，这些事件往往会对投资产生重大影响，导致投资风险的加大。

英文：What is the essence of investment risk? This is a question that every investor needs to think deeply about. Investment risk refers to the various uncertainties and potential losses investors face in the investment process. This risk not only exists in the financial sector such as stocks and funds, but also in various fields such as real estate and industry.

The essence of investment risk can be understood in the following points:

Firstly, investment risk is uncertainty. This uncertainty may come from market fluctuations, changes in the economic environment, policy adjustments and other aspects. Investors need to evaluate and predict these uncertainties when making investment decisions, but these predictions often have errors, resulting in the existence of investment risks.

Secondly, investment risk is related to the subjective factors of investors. Investors' investment goals, risk preferences, investment periods and other factors will affect their investment decisions, and these factors are often difficult to accurately predict and control, thus increasing the possibility of investment risks.

Finally, investment risks have both foreseeability and unforeseeability. Investors can predict and avoid some risks through research and analysis of the market and policies. However, some risks are unforeseeable, such as unexpected events and black swan events, which often have a significant impact on investments and increase investment risks.