求翻译：Duchenne（杜兴氏）等人观察到人体肌肉在电刺激下产生的肌肉收缩现象在19世纪中期，他和助手一起研究了在面部刺激不同部位，肌肉收缩产生不同的表情变化。（图二）是什么意思？

duchenne (Duchenne), who observed the phenomenon in the mid-1800s, he and his assistant with research to stimulate different parts of the face, muscle contraction produce different changes in the expression of human muscle produced by electrical stimulation of muscle contraction. (Figure 2).

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Duchenne (Du Xingshi) et al. observe the human body muscle the contracture of muscle phenomenon which produces under the electricity stimulation in the 19th century intermediate stages, he and the assistant studied together in the face stimulation different spot, the contracture of muscle has had th

Duchenne (Du Xing), who observed that the muscles of the human body under the stimulation of muscle contraction in the middle of 19th century, he studied in the face with his assistant to stimulate different parts of different facial expression changes of muscle contraction. (Ii)

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