"The immune system is like a double-edged sword; it can fight cancer but also needs to be controlled."
自信不是天生的，是慢慢培养出来的。
孔子说：“明智的人喜欢水，仁慈的人喜欢山；明智的人好动，仁慈的人好静；明智的人快乐，仁慈的人长寿。”
The human heart, at whatever age, opens only to the heart that opens in return.