As trees became scarce and they could no longer construct wooden canoes for fishing, they ate birds.
由于树木变得稀少，他们不能再建造木制的独木舟来捕鱼，只好捕食鸟类。
Trees, he says, are also a source of natural medicines, no small advantage in an area where modern health care is scarce and expensive.
他认为树木也是天然的药物来源。在健康护理资源稀少并且昂贵的地区，这的确有着不小的作用。
The fungus attacks the roots of the trees, choking off a water supply that has been made scarce by successive years of drought.
疫霉菌攻击树木的根，更在连年干旱的情况下切断了它们供水。
Some cacti, like the saguaro, grow to tree size, but true trees need more moisture than most desert environments can supply, so they are scarce on deserts.
一些仙人掌，如撒瓜罗，能长到象树那么高。但真正的树却需要比大多数沙漠所能提供的更多的水份，所以树在沙漠里是鲜见的。
Because there is little water in the desert, trees are scarce.
由于沙漠中缺水，所以树很少见。
The leaves of the trees begin to turn golden yellow and rainfall is scarce.
秋天树叶开始变成金黄色，雨量逐渐稀疏。
The leaves of the trees begin to turn golden yellow and rainfall is scarce.
秋天树叶开始变成金黄色，雨量逐渐稀疏。
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