a submarine or submersible vessel

潜艇或潜水器

a long-roll sandwich; a submarine sandwich

长条面包做的三明治；潜艇堡

a substitute, especially a replacement player or teacher

替补或代课者，尤指替补球员或代课老师

to act as a substitute; to replace a player

充当替代者；换下或换上球员

a subscription or a subscriber, especially online

订阅或订阅者，尤指线上

a subtitle, often for films or TV

字幕，常用于电影或电视

to add subtitles to video content

为视频内容加字幕

a subroutine in a computer program

计算机程序中的子程序

a subeditor or copy editor

（英式）文字编辑；版面编辑

to copy-edit or subedit text for publication

进行文字编辑或校订以供发表

a subcontractor hired by a main contractor

由总承包商聘用的分包商

a speaker designed for very low frequencies

用于超低频的扬声器；低音炮

a submitted work for publication; a manuscript

投稿作品；待发表的稿件

a school subject or area of study

学科；研究领域

a subreddit community on the Reddit platform

Reddit 平台上的子版块社区

under; less than; below a stated level

在……之下；少于；低于某一水平