学习与写信有关的词汇，如信纸、墨水和信封等。

Learning vocabulary for letter writing: writing paper, ink, envelopes.

youdao

提交作品须提供LOGO用于名片、宣传样本。手提袋，信封等的搭配效果图(仅效果)。

LOGO for the submission of entries are required to provide business CARDS, promotional samples. Handbags, envelopes, etc. with effect diagram (only effect).

youdao

该方案主要以目前比较成熟的公钥密钥学理论为基础，用到了RSA加解密、摘要、数字信封等算法。

This scheme is based on the theory of public key cryptography, with some algorithms about RSA, Hash Digest and digital envelop.

youdao