一,学长:senior,upperclassman。
二,学姐:senior。
三,学弟:junior,junior fellow student。
四,学妹:junior,junior female schoolmate。
例句:Hello, senior. Have you seen my senior sister? I want to tell her that I like my junior sister. Please don't pester me.
你好学长,你看见学姐了吗,我想告诉她我喜欢的是学妹,请她不要在纠缠我这个学弟了。