1. native to the Moluccas and Philippines; a source of dammar resin. 
   原产摩鹿加和菲律宾群岛；分泌达马树脂。
2. tall trees native to the Australian region; source of timber and medicinal oils from the aromatic leaves. 
   土产于澳大利亚的高树；产木材和药油来自芬芳的叶子。
3. A buckthorn(Rhamnus purshiana) native to northwest North America, the bark of which is the source of cascara sagrada. 
   药鼠李树原产北美洲西北部的一种药鼠李树（珀希鼠李鼠李属），其树皮是药鼠李皮剂的原料
4. charateristics of source rock 
   生油岩标志
5. current source inverting circuit 
   电流型逆变电路

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