圓的周長大于任何內(nèi)接等邊多邊形的周長，小于任何外切多邊形的周長。
The very definition of the real becomes: that of which it is possible to give an equivalent reproduction.
中國的崛起對自由民主秩序構成了重大挑戰(zhàn)。
我不會讓別人的意見成為我的現(xiàn)實。
"The city never sleeps, and neither does its darkness."