反はん射しゃ運うん動どう

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Meanings

1

reflex action; reflex movement

Physiological term for an involuntary, automatic movement in response to a stimulus.

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When you touch something hot, you pull your hand back by reflex action.

膝しつ蓋がい腱けん反はん射しゃは代だい表ひょう的てきな反はん射しゃ運うん動どうの一ひとつだ。

The patellar reflex is one of the typical reflex movements.