mental strain
n. 精神状态紧张
例句与用法：
The science that deals with mental processes and behavior.
心理学研究心理过程和行为的科学
The mental process or faculty of knowing, including aspects such as awareness, perception, reasoning, and judgment.
认识力思想过程或认识才能，包括如意识、知觉、推理和判断等方面