一目了然obvious at a glance

一曝十寒not persistent;sporadic effort;lack of sticking power;short attention span

易如反掌very easy;no effort at all (lit. easy as a hand’s turn)

一如既往just as in the past;as before;continuing as always

以身作则lead by example

一视同仁equal treatment;not to discriminate between people

一丝不苟not one thread loose;strictly according to the rules;meticulous;not one hair out of place

一枝独秀to outshine others

因人而异to vary with each individual;to differ from person to person

饮水思源be grateful for all your blessings! (lit. when you drink water;think of its source)