81. Although we do not know the long-term consequences of separation or deprivation , we do know that they can produce acute immediate distress .
雖然我們不知道分離和喪失親人的長期后果，但我們知道它們能立即引起劇烈的悲痛。
82. One can raedily trace the disappearance of dinosaurs to a major cataclysmic event .
人們很容易把恐龍消失的原因歸結為重大的災難性事件。
83. The raesons for poverty are many , but for the most part center on illiteracy , the lack of opportunities and in some cases pure laziness .
貧困的原因很多，但主要是因為缺少教育、缺少機會，有的情況下純粹是由于懶惰。
84. Child development depends on a number of factors , both physical and psychological . Correct parental nurturing from infancy through adolescence determines both the physical and mental profile of a mature individual .
兒童的發(fā)展取決于很多因素，包括生理的和心理的。從嬰兒期到青春期的正確的家長教育決定一個成熟的個人的體質及智力的狀況。
85. Factors such as self-condidence and
