他老是记不起把自己阅读时用的放大镜放在什么地方，所以助手们会随身携带备用的。He misplaces his reading glasses with such regularity that aides carry extras.大货车载着备用的弹药。The wagons carried spare ammunition.我可能需要一套备用的衣服。I might need a spare set of clothes....
这种疾病据说起源于热带地区。The disease is thought to have originated in the tropics.这风俗起源于苏格兰.The custom is of Scottish derivation.众所周知,针灸起源于中国.It's known that acupuncture originated in China....
Except for smoking and drinking, he is a thrifty man.除了抽烟、喝酒, 他是个生活节俭的人.Be thrifty and hardworking in whatever undertaking you are to start on.办任何事都要勤俭.Lei Feng, always thrifty, had saved this sum from his allowances.雷锋一...