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石洞 shídòng
agric. cavern
desert. taouerta (复数: tiyourten, 撒哈拉)
tech. stone cavern
石洞
: 46 phrases in 12 subjects
Bridge construction4
Earth sciences1
Ecology1
Electronics2
Engineering geology7
Exhibitions2
General2
Hydroelectric power stations2
Mountaineering1
Oil / petroleum2
Space1
Technology21