sos即S.O.S，是国际摩尔斯电码救难信号，并非任何单词的缩写，特点是三短三长三短。
紧急求救信号
SOS
英 [ˌes əʊ ˈes]美 [ˌes oʊ ˈes]
n.(船舶或飞机发出的)紧急呼救信号；紧急求助的请求
举例：
1.The ferry did not even have time to send out an SOS.
渡船甚至连发出紧急呼救信号的时间都没有。
2.We've received an SOS from the area asking for food parcels.
我们收到来自那一地区的紧急求援信息，他们急需食物包。
3.And your kid can send you an SOS message by pressing the Kurio's power button repeatedly.
而且你的孩子还可以通过重复按下手机上的电源键发送SOS紧急救援短信给你。
4.An SOS signal made of rocks in a remote part of Western Australia has prompted fears that someone, or more than one person, could be missing. 近日，西澳大利亚偏远地区发现了一个由石头堆成的SOS信号，人们担心可能不止一个人失踪了。
5.The report, now in its eighth year, is compiled and released annually by International SOS, and global risk and strategic consulting firm Control Risks.
该报告现已来到了第八个年头，每年都由合资企业国际SOS及全球风险和战略咨询公司化险咨询编制并发布。
