O
One cloud is enough to eclipse all the sun.一叶障目，不见泰山。
One swallow does not make a summer.一花独放不是春。
One can not be in two places at once. 一心不可二用。
Obedience is the first duty of a soldier. 服从是军人的天职。
One lark does not make a spring. 一花独放不是春。
P
Practice is better than precept. 身教重于言教。
Poverty is stranger to industry. 勤劳之人不受穷。
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