smart gear、lean up、lean down都是是什么意思?

smart gear、lean up、lean down都是是什么意思? lean 是什么意思 Lean lean culture是什么意思 Lean Logistic的中文是什么意思 The stars lean down to kiss whenever your down you know that you can lean on don't lean down to your plate的意思 lean against与lean on差别是什麼? lean the piano还是lean piano Lean to be master of your emotions是什么意思 don t lean ont of the window是什么意思