Once-through
直流，直通
🧩 词语组成解析
through
[θru]
prep. 通过，穿过;经由;透过;凭借;
adv. 从头到尾;彻底;自始至终;
adj. （电话）接通;通话完毕;有洞的;直达的;
🗣️ 情景例句
Six words.
有六个字。
What part of the world do you come from?
你从世界的哪部分来的？
Was he absent from school last week?
上星期他没上学吧？