积薪和苇苣均是烽燧所用燃料，用以点火或举烟传递报警信号。

Both Jixin and Weiju were fuels used by the beacon tower for being lighted to give out fire or smoke to communicate alarm signals.

第二部对汉代居延地区候望系统的运作方式进行研究，由侦察与巡逻、烽火传递与烽燧自身的防御等几个方面的内容构成。

The second, research the acting means of presentiment system, this part is consist of spy and patrol signal fire transferring and recovery per se.