seal with single-cone

例句：

1. 1. The letter was sealed with a single-cone seal.
   这封信是用一个单尖印章封上的。
2. 2. The official document was sealed with a single-cone seal.
   官方文件是用一个单尖印章封上的。
3. 3. The package was sealed with a single-cone seal.
   包裹是用一个单尖印章封上的。