求翻译：During the oral phase the mouth is the prime source of pleasure, for survival. The baby instinctively sucks from which it obtains pleasure. Through oral satisfaction, the baby develops trust and an optimistic personality. If there is a lack of oral stimulation (i.e. if we are weaned too early) there is a risk of being stuck at this stage, described as oral fixation. Freud believed that the personality of a baby in oral fixation may become pessimistic or aggressive. The locus of attention shifts to the anus during the second and third years of life. The child becomes aware of its bowels and how to control them. The focus here is on toilet training and the child can choose to give or withhold faeces in order to provide pleasure. By deciding itself, the chid takes an important step of independence.是什么意思？

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