🧩 词语组成解析
🗣️ 情景例句
What do people usually do on that day?
在这一天，人们通常干什么？
Is that a book?
那是一本书吗？
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。