自信是伟大事业的第一要素。
zì xìn shì wěi dà shì yè de dì yī yào sù.
Self-confidence is the principal element of any great endeavor.
所以，友情也是幸福的一个要素。
suǒ yǐ, yǒu qíng yě shì xìng fú de yī ge yào sù.
So friendship is also a requirement for happiness.
资本、土地和劳动是生产的三大要素。
zī běn, tǔ dì hé láo dòng shì shēng chǎn de sān dà yào sù.
Capital, land and labor are the three key factors of production.