Examples
zhù yì注意，zuì最dà大zhí值bù不zǒng shì总是cún zài存在de的。
注意，最大值不总是存在的。
Note that the maximum doesn't always exist.
请考虑一下，最大值在有些情况下是不存在的。
Please consider that the maximum doesn't exist in some circumstances.
当你值勤时最好不要抽烟。
You had better not smoke while on duty.