They made an emotional appeal for help.

他们情绪激动地恳求救助。

《牛津词典》

An appeal is being made for help for those who lost their homes in the earthquake.

正在呼吁援助在地震中失去家园的人们。

《新英汉大辞典》

Sri Lankan police on launched an appeal for the public to donate their pet dogs to help the fight against terrorism and crime on the war-torn island.

斯里兰卡警方呼吁大众捐献出自己的宠物狗，为这个饱受战乱之苦的岛屿反恐反犯罪的斗争助一臂之力。

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His parents and girlfriend have made an appeal for help in catching his killers on the second anniversary of his death.

BBC: Samuel Guidera murder: Parents appeal to help catch killer

Emma Gowing described her "beautiful sister" as the "light of my life" during an appeal for help at a news conference on Thursday.

BBC: Catherine Gowing: Car found belonged to missing vet

Now, despite the many learned treatises written on the network effect, it remains unpredictable - what decides whether a joke goes viral, or an appeal for help remains unheard?

BBC: A lost bag - returned by the open web