次方的表达：
For example, a polynomial x^109 + 9x^5 − 2x^2 is most likely pronounced:
x to the hundred and nine plus nine x to the fifth minus two x squared.
循环的表达：
It is noted that when ‘for’ loop execution starts, first variable initialization is done, then condition is checked before execution of statements;
if and only if condition is TRUE, statements are executed; after all statements are executed, iteration of counter of loop is done either increment or decrement.
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