I gave her very explicit directions how to get here.我明确地告诉她来这儿怎么走。
She was very explicit about (= said very clearly and exactly) what she thought was wrong with the plans.她明确地指出了计划中她认为有误的地方。
I wasn't aware that I would be paying - you certainly didn't make it explicit (= state it clearly).我不知道我得付款——毫无疑问是你没说清楚。