Ethoxyline
环氧树脂
🗣️ 情景例句
A community center
一个社区中心
Open your books and turn to page 20.
打开书，翻到第20页。
The search proved difficult, for the puma was often observed at one place in the morning and at another place twenty miles away in the evening.
事实上搜寻工作很困难，因为常常是早晨在甲地发现那只美洲狮，晚上却在20英里外的乙地发现它的踪迹。