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
you know how Dad is always talking about
知道爸爸时常谈起
I tried to call you, but the line was busy.
我试着给你打电话，但老占线。
'Would you mind unlocking this suitcase please?'
“请打开这只手提箱好吗？”