taconstant(经常的)age,buttherearecaseswherespeechhasstartedlateinachildwhoeventually(终于,最后)turnsouttobeofhighIQ.Recentevidence(根据)suggeststhataninfantisbornwiththecapacity(能力)tospeak.WhatisspecialaboutMan’sbrain(脑力,pared(比较,对照)withthatofthemonkey,plex(复杂的)systemwhichenables(使能够,使可能)achildtoconnectthesightandfeelof,say,ateddy-bear(玩具熊)withthesoundpattern(式样)“teddy-bear”.Butspeechhastobestimulated(刺激,激发),andthisdependsoninteraction(相互作用,干扰)betweenthemotherandthechild,wherethemotherrecognizesthesignals(信号)inthechild’sbabbling(牙牙学语),grasping(贪心的,贪婪的),crying,smiling,andresponds(响应)tothem.Insensitivityofthemothertothesesignalsdulls(枯燥的,不鲜明的)theinteractionbecausethechildgetsdiscouraged(泄气的)andsendsoutonlytheobvioussignals.Sensitivity(?敏感)tothechild’snon-verbal?signals?isessential(?必要的)tothegrowthand
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