activity directed simulation的用法和样例：
- Physical or mental effort or activity directed toward the production or accomplishment of something.
- The method is a direct simulation of the actual process of radiation propagation.
- G. A. Bird, "Molecular Gas Dynamics and the Direct Simulation of Gas Flows", London, Oxford Univ. Press (1994).
- Abstract: Direct simulation Monte Carlo method has been successfully applied into simulation of rare gas.
- Direct simulation Monte Carlo method has been successfully applied into simulation of rare gas.