意思是说他在西安对于张杨所提出的条件没有签字，但是愿意采纳那些有利于国家民族的要求，不会因为未签字而不守信用。

• This means that, although he did not sign the terms set forth by Chang and Yang in Sian, he is willing to accept such demands as are beneficial to the state and the nation and will not break his word on the grounds that he did not sign.