A.p.i. baum'e gravity
[机] A.P.I.波美比重单位
🧩 词语组成解析
🗣️ 情景例句
Something simple--but a good one.
要简单的，但要精美 。
All is not at hand that helps.
有用的东西并不都是垂手可得的。
Because of this, we kept looking back, wondering if we were leaving a trail of oil and petrol behind us.
因此，我们不时地掉过头，怀疑车后是否留下了机油和汽油的痕迹。