1
call the hotline
hotline 常与 call 搭配，表示拨打热线。
If you have any questions, call the hotline.
如果你有任何问题，请拨打热线电话。
热线电话；热线
hotlines — plural of hotline
先理解核心含义，再看它在真实句子里的用法。
热线电话；热线
a special telephone line that people can call for information, advice, or help, especially in an emergency
If you have any questions, call the hotline.
如果你有任何问题，请拨打热线电话。
始终有人值守并能立即提供帮助的电话线路。
A telephone line that is always staffed and able to give immediate assistance.
两人之间的直接专线,尤指国家元首间用于紧急情况的专线。
A direct line between two people, especially one between heads of state to be used in an emergency.
If you are feeling lonely, you can call a free hotline for support.
如果你感到孤独，可以拨打免费热线电话寻求支持。
The company set up a hotline for customers to report technical problems.
公司设立了一条热线，供客户报告技术问题。
Many universities offer a 24-hour hotline for students in crisis.
许多大学为学生提供24小时热线服务。
hotline 常与 call 搭配，表示拨打热线。
If you have any questions, call the hotline.
如果你有任何问题，请拨打热线电话。
for 后接服务或用途，说明热线设立的目的。
The bank has a hotline for lost or stolen cards.
该银行设有银行卡挂失热线。
between 后接两个机构或人物，表示双方之间的专线。
The two leaders have a direct hotline between their offices.
两位领导人的办公室之间设有直通热线。
Not this
Please call hotline if you need help.
Use this
Please call the hotline if you need help.
hotline 是可数名词单数，在句中作宾语时前面需要限定词（如 the），不能像汉语“打热线”那样裸用；这里指特定的热线服务，所以加 the。
Not this
I called to the hotline but no one answered.
Use this
I called the hotline but no one answered.
表示打电话给某人或某机构时，call 是及物动词，直接接宾语，不加 to；call to someone 意为“朝某人大喊”，语义不同。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
拨打热线电话
If you have any questions, call the hotline.
如有任何问题，请拨打热线电话。
热线电话号码
Please write down the hotline number in case of an emergency.
请记下热线电话号码，以备紧急情况使用。
免费热线电话
The company provides a toll-free hotline for customer service.
该公司提供免费的客服热线电话。
危机热线
She called the crisis hotline for immediate support.
她拨打危机热线寻求即时支持。
设立热线电话
The government set up a hotline to answer public inquiries.
政府设立了热线电话，以解答公众咨询。
与某人有直通热线（比喻能直接、快速地联系或获取信息）
She seems to have a hotline to the boss, so she always knows the news first.
她似乎和老板有直通热线，所以总是第一个知道消息。
我知道当热线电话响起时，那只能意味着一件事。
Drake uses 'hotline bling' in his 2015 song 'Hotline Bling' to describe the flashing light of a phone when someone calls.
德雷克在2015年的歌曲《Hotline Bling》中用“hotline bling”来描述来电时手机闪烁的提示。
Use hotlines naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
hot（热）＋line（线）＝热线：想象一条发烫的线直通服务台，拨通即有人接。
语域：neutral 常见场景：客户服务、应急求助 hotline 通常指为咨询、求助或服务而设的专用电话线路，多用于客服、政务及公共服务场景，日常口语和书面语中都比较常见。
这些词都以 -line 结尾，读作 /laɪn/，与 hotline 的第二音节 /laɪn/ 押韵。注意拼写相似的 linen /ˈlɪnɪn/、lineage /ˈlɪniɪdʒ/、linear /ˈlɪniər/ 发音不同；hotline 的第一音节 hot 读 /hɑt/，而 hotel 开头读 /hoʊ/。
Dictionary facts from ECDICT, WIKTIONARY.