Sers
表面增强拉曼谱仪
🗣️ 情景例句
But your L C must reach us 30 days before delivery.
但交货前30天，我们必须要收到你们的信用证。
Please try it.
请试试看。
The snake then wound itself round the wires.
于是蛇就缠住了几根电线。