elementary characters的用法和樣例：
例句
- Unobtrusiveness and robustness are two elementary characteristics of watermarking technology.
不可見性和魯棒性是數字水印的兩個基本特徵。 - The paper discusses the essence characters of digital libraries and the technology problems faced during constructing digital libraries.
論述了數字圖書館的基本特徵以及建設數字圖書館所面臨的技術問題。
