求翻译：Duchenne（杜兴氏）等人在19世纪中期观察到人体肌肉在电刺激下产生的肌肉收缩现象，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), in the mid-19th century, observed in human muscle produced by electrical stimulation of muscle contraction phenomenon, he and his assistants together to stimulate different parts of the face, muscle contractions produce different changes in the expression. (Figure 2).

Duchenne (DU-hing), who was in the mid 19th century human body muscle in electrical stimulation of the muscles, and he and his assistant with the study on the face, stimulate different parts of the muscle contractions produce different looks. (figure 2)

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

Duchenne (Du Xing) and others in the middle of 19th century observed under the stimulation of muscle contraction in the muscle of the human body, 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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