ITmedia�̓A�C�e�B���f�B�A�������Ђ̓o�^���W�ł��B
respond_to do |format|。新收录的资料对此有专业解读
Developers would often write helper functions that accidently mutated the original Date object in place when they intended to return a new one:。业内人士推荐新收录的资料作为进阶阅读
more than half of the reviews did get comments about defects!，这一点在新收录的资料中也有详细论述