这段话的中文意思是?Among the kinds of social gestures most significan

这段话的中文意思是?
Among the kinds of social gestures most significant for second-language teachers are those which are identical in form but different in meaning in the two cultures.For example ,a Colombian who wants someone to approach him often signals with a hand movement in which all the fingers of one hand,cupped,point downward as they move rapidly back and forth.Speakers of English have a similar gesture though the hand may not be cupped and the fingers may be held more loosely,but for them the gesture means goodbye or go away,quite the opposite of the Colombian gesture.Again,in Colombia,a speaker of English would have to know that when he indicates height he must choose between different gestures depending on whether he is referring to a human being or an animal.If he keeps the palm of the hand parallel to the floor,as he would in his own culture when making known the height of a child,for example,he will very likely be greeted by laughter;in Colombia this gesture is reserved for the description of animals.In order to describe human beings he should keep the palm of this hand at a right angle to the floor.Substitutions of one gesture for the other often create not only humorous but also embarrassing moments.In both of the examples above,speakers from two different cultures have the same gesture,physically,but its meaning differs sharply.