病毒的复杂性提醒我们，关于生物学我们还有很多需要学习。

Not hammer-strokes， but dance of the water sings the pebbles into perfection。

Every challenge in farming is an opportunity to innovate and improve.

The advantages found in history seem to be of three kinds， as they result either from the mere situation of the climate and country or from the form of government and of the character of the people， or from those finer principles and morals， which may be called the recommendations of philosophy.