There are some areas of wetland which are of ancient origin.有一些湿地在古代就形成了。Therefore , sustainable development should become the direction to Honghu wetland ecotourism.洪湖湿地生态也面临一些生态问题,影响了湿地生态旅游的开展.Today, I want to serve as...
prehistoric hunters and gatherers史前的狩猎者和采集者The brazil nut gatherers were paid only 2 to 3 percent of the New York wholesale price.这些巴西果采摘者所卖的钱仅为纽约批发价格的2%到3%。The earliest people were roving hunters and gatherers who made ...
植物茎往上长时表现出负向地性.The main stems of a plant show negative geotropism as they grow upwards.根系向地性变化可由缺磷等因素所诱导, 且存在著一定的遗传变异性.Root gravitropic responses are adaptive , inheritable traits induced by low phosphorus availability a...