Sildenafil
n. 西地那非; [医]昔多芬, 一氧化氮样药物, 商品名Viagra（伟哥）
🗣️ 情景例句
I bought it in an antique shop
我在一家古董店买的，
It is one thing to speak much and another to speak pertinently.
话讲得多是一回事，讲得恰当是另一回事。
No, thanks, Tom.
不，谢谢，汤姆。