Radical 月

13 strokes

moon 月 (61) + retreat 退 (728) = leg 腿

[大腿 (47) dàtuǐ thigh]

(The Apollo astronauts had finished their moonwalk) They had to leave the moon and make a rapid retreat into their spacecraft (before their oxygen ran out), but one trapped his leg in the airlock. / Back inside the lunar module the ghostly teddy who looked after the astronauts measured the leg with a tape measure (to see if it was all there!)