乃是的英文：
to be

参考例句：
  • The very reputation of being strong-willed, plucky, and indefatigable is of priceless value. ——Charles Robert Darwin
    意志坚强、胆量过人和不屈不挠的名声，乃是一种无价之宝。——达尔文
  • Perhaps the most thoroughly analyzed hereditary disease are those in which abnormal hemoglobin molecules are produced
    也许最详尽分析过的遗传性的疾病，乃是那些产生异常血红蛋白的遗传病。
  • Variety is the spice of life.
    变化乃是生活的情趣。
  • Temperance is the best physic
    克制乃是最好的治疗
  • This custom is a relic of ancient times.
    这习俗乃是古代遗风。
  • Venice is the child of her own tumultuous past.
    威尼斯乃是它自己的动乱岁月的产物。
  • This special property of laser light is the basis of holography
    激光的这种特殊性质乃是全息照相的基础。
  • Venice is the child of her own tumultuous past
    威尼斯乃是它自己的动乱岁月的产物。
  • Truth's best ornament is nakedness.
    不加掩饰乃是真理的最好装饰。
  • Another fundamental concept in ecology is that energy flow through the ecosystem
    生态学的另一个基本概念乃是生态系统中的能流。

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