导读:飞行员在澳大利亚西部野外发现SOS求救信号，警方怀疑有人失踪，搜索进行中，但尚未确定来源。
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.
西澳大利亚偏远地区发现了石头堆成的SOS信号，人们担心可能有人失踪。
The distress signal was spotted by a helicopter pilot. It led to a ground search by police who had to reach the area by air because of tough terrain.
遇险信号被直升机飞行员发现。随后警方展开地面搜查，但由于地势艰难，警察必须乘飞机到达该地区。
Authorities have now appealed for public help after failing to find "any indication of recent human activity".
在没有找到“任何近期人类活动迹象”后，他们现在已经呼吁公众帮忙。
However, police said they had discovered the remains of a campsite at the scene, which is at Swift Bay about 500km (300 miles) from the city of Broome.
然而，警方表示，他们发现现场有露营的痕迹，就在距离布鲁姆市约500公里（300英里）处的斯威夫特湾。
"Police are trying to establish if there are any missing persons in the area who require assistance," they said in a statement.
警方在声明中说：“警方正在设法确定该地区是否有任何需要援助的失踪人员。”
Senior Sgt Peter Reeves told the Australian Broadcasting Corp that the message may have been there for years.
高级专员彼得.里夫斯告诉澳大利亚广播公司，这个求救信号可能已经在那儿好几年了。
"There are indications that there may have been someone camped there at one point in time, but it is just not clear how long ago that was," he said.
他表示：“有迹象表明，可能有人在那里露营过，但是不清楚是多久以前，”他说。
In 2015, a British tourist lost in a remote area of Queensland was rescued after writing an SOS message in sand.
早前在2015年，一名英国游客在昆士兰偏远地区迷路，在沙漠中写下SOS讯息后获救。
