be certain about be certain of make sure that … be sure to do sth = be sure of / about sth
Related Translations:
把握: 1.(掌握; 抓住) grasp; hold; seize 短语和例子把握时机 seize the opportunity [chance]; seize the right time; 把握本质 grasp the essence2.(把事情办成的根据或信心; 成功的可靠性) assurance; certainty 短语和例子把握不大 be not quite sure