介绍了基于单片机8051PWM 控制的电动机原理，阐述了8051与直流电动机构成的电机可逆控制和不可逆控制的实现过程。
This paper introduces the principle of electromotor based on single chip computer 8051PWM, and the realization process of reversible control and non-reversible control.
他给出的忠告包括：控制期望、选择不可逆的决定、避免进行社会比较，还有学会喜爱约束。
Among his solutions: Control expectations, make decisions non-reversible, avoid social comparisons and 'learn to love constraints.'
微波对组织的辐射是一种非电离辐射，适当控制微波发射功率和照射时间，不会对组织造成不可逆损害。
Microwave irradiation to tissues is a kind of nonionizing radiation, which would not cause irreversible lesion of tissues if microwave irradiation power and time were controlled properly.
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