iteration point的用法和樣例：
例句
- The smaller the value of the merit function is, the closer the iteration point is to the solution.
當價值函數的值越小時，迭代點越靠近最優解。 - Furthermore, the model will keep iterating within the feasible region whenever the iterative point is feasible, and become feasible decreasing directions method.
進一步地，一旦迭代點進入可行域，模型就能保持在可行域內迭代，成為可行下降類演算法。
