大脑面临着从感官来解释物理刺激的基本问题。
The brain faces the fundamental problem of interpreting physical stimuli from the senses.
由于苯酚对人体有刺激性作用，它基本上已不再被当作常用的防腐剂了。
Because of its irritating effect on humans, the use of phenol as a general antiseptic has been largely discontinued.
这些是特意设计的，向孩子介绍世界以及“刺激好奇心，掌握基本决策的技能，获得成就感”。
They are purposely designed to introduce the baby to the world at large and “stiumulates curiosity, develops fundamental decision-making skills, and celebrates a sense of achievement”.
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