Saratin
乳清酸
🗣️ 情景例句
A little further back, Tom.
再往后一点 Tom。
To paint the roof
油漆屋顶
If they knew how difficult it was to drill through the hard rock, they would lose heart.
如果他们知道了钻透那坚硬的岩石有多么困难，他们会丧失信心的。