1、The email was sent with a signatureless reply, making it difficult to identify the sender.
這封電子郵件是沒有簽名的回復(fù),很難確定發(fā)件人。
2、The document appeared to be unsigned and signatureless, raising suspicions about its authenticity.
這份文件看起來沒有簽名,沒有任何簽名標(biāo)記,引發(fā)了對(duì)其真實(shí)性的懷疑。