The principal function of the urinary system is to maintain the volume and composition of body fluids within normal limits.

泌尿系统的主要功能是保持体液的容积和组成在正常范围内。

But when it was set up in 1711, its principal function was to absorb or convert unfunded government debt to take it off the market, to turn it into shares in the company.

但当它于 1711 年成立时， 其主要职能是吸收或转换没有资金来源的政府债务， 将其从市场上撤出，将其转变为公司的股份。

After being delivered by military transport aircraft like the Antonov An-22 or Ilyushin II-76 The Mi-26 is principal function was to ferry military equipment to remote places, including 13 tonnes amphibious armored personnel carriers and mobile ballistic missiles.

在由安东诺夫 An-22 或伊柳申 II-76 等军用运输机运送后， Mi-26 的主要功能是将军事装备运送到偏远地区，包括 13 吨两栖装甲运兵车和机动弹道导弹。