It's worth mentioning that temperature and pressure are also important factors affecting hydrates not only because an excessively high temperature or low pressure will result in melting of the hydrates but also because the chemical interaction between gas molecules and water cages might be significantly influenced. Therefore, the study of the mechanical properties of hydrates needs to consider a number of additional factors besides the current theoretical results which will be performed in our future work via simulations in a larger scale in combination with more experimental results in order to build a reliable theory on clathrate hydrates.