These include inadequate supplies of biomass to meet even today's demand, and the related worries about how the push for more such crops may encourage land-clearance and lead to rising food prices.
这些问题包括可用于生产生物燃料的粮食供应不足，以及粮食需求量增加导致的开荒种地和粮食价格上涨。
2
Thai Airways said the plane had been given clearance to land.
泰国航空公司说该飞机已经被授予了着陆的官方许可。
《柯林斯英汉双解大词典》
3
The pilot was given clearance to land by air traffic control.