Student fees are their principal source of income.
学费是它们的主要收入来源。
As in Asia, contact with infected birds is the principal source of infection.
如同在亚洲一样，接触受感染的禽鸟是主要感染源。
Natural gas is already the principal source of heat in half of American households.
天然气已经是美国大半家庭的主要热能来源。
The posttraumatic hydrothermal solution is the principal source of ore-forming fluid.
断裂和岩浆岩是两大重要的成矿地质条件。
Differences such as these, claimed Porter, are a principal source of competitive advantage.
波特认为，正是这些不同，成为了这两家公司的竞争优势。
In many parts of the world renewable energy is already a principal energy source.
在世界许多地方，可再生能源已经是一种主要的能源来源。
Liuzhou's principal water source for industrial, commercial, and residential use is the Liujiang River.
柳江是柳州市工业、商业和居民生活用水的主要水源。
Weihe river is the biggest river and principal surface water source in Guanzhong Basin.
渭河是关中地区最大的河流，是该地区主要的地表水水源。
Weihe river is the biggest river and principal surface water source in Guanzhong Basin.
渭河是关中地区最大的河流，是该地区主要的地表水水源。
应用推荐