Single order production type plays a great role in industry on account that the complicated production variation leads to its complication and difficulty in production planning and controlling.
单件订货生产类型在整个工业中占很大的比重，由于复杂多变的生产特点，造成其生产计划与控制的复杂化和困难化。
Klein lays particular emphasis on the fact that envy leads to psychic attacks on the goodness of the object, which if unchecked, lead to great difficulty in taking in and learning.
Klein强调了那些嫉羡导致对客体“好”(好的部分)的攻击的事实，这些如果没有被检测，会导致吸收和学习的严重困难。
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