2. Final
inflection, which is the pitch change at the end of an utterance , has underlying meaning.

句尾语音变化,即一句话结束时的音调变化,包含着一定的意义。
3. Find the critical number, point of
inflection, relative extrema, increasing or decreasing interval, concave upward or downward interval of the function.

找出此函数的端点,反曲点,相对极值,递增或递减区间,凹向上或凹向下的区间。