4 sentences

1. 你得打电话求救。

   nǐ děi dǎ diàn​huà qiú​jiù.

   You have to call for help.

   Source: OpenSubtitles

2. 救援队利用无线电台发出了求救信号。

   jiù​yuán​duì lì​yòng wú​xiàn diàn​tái fā​chū le qiú​jiù xìn​hào.

   The rescue team used a radio station to send out a distress signal.

   Source: Dong Chinese Dictionary

3. 他在森林里迷路了，急忙发出求救信号。

   tā zài sēn​lín lǐ mí​lù le, jí​máng fā​chū qiú​jiù xìn​hào.

   He got lost in the forest and hurriedly sent out a distress signal.

   Source: Dong Chinese Dictionary

4. 救援队迅速回应了灾区发出的求救信号。

   jiù​yuán​duì xùn​sù huí​yìng le zāi​qū fā​chū de qiú​jiù xìn​hào.

   The rescue team responded quickly to the distress signals sent from the disaster area.

   Source: Dong Chinese Dictionary