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- Vitamins were first called accessory food factors' since it was discovered, in 1906, that most foods contain, besides carbohydrates, fats, minerals and water, these other substances necessary for health. 维生素最初被叫做“辅助食物素”，1906年人们发现大多数食物除了含有碳水化合物、脂肪、各种矿物质和水以外，还含有这种人体所需要的物质。
- Vitamins were first called accessory food factors'since it was discovered,in 1906,that most foods contain,besides carbohydrates,fats,minerals and water,these other substances necessary for health. 维生素最初被叫做“辅助食物素”，1906年人们发现大多数食物除了含有碳水化合物、脂肪、各种矿物质和水以外，还含有这种人体所需要的物质。
- Is it necessary for me to attend the meeting? 我真的必须参加这个会议吗？
- Personal health is necessary for this job. 做这种工作需要健康的身体。
- I think it's necessary for us to read a lot. 我认为大量阅读是必要的。
- She hasn't the experience necessary for the job. 她没有做那事所需要的经验。
- A balanced diet is necessary for good health. 均衡的饮食是保持健康所必需的。
- We were given more money than necessary for the project. 我们被给了比计划所要求来得更多的钱。
- For health's sake, I suggest you never eat in the night market. 为了健康的缘故，我建议你永远不要在夜市吃。
- Proper diet and exercise are both important for health. 适当的饮食和运动对身体健康都很重要。
- Some people give higher priced gifts than necessary for the situation. 有些人给了比情况所必要来得更高价的礼物。
- Is it necessary for us to meet/necessary that we meet? 我们非见面不可吗?
- It's necessary for us to net the currant bushes. 我们有必要用网盖上红醋栗树。
- Great persistence is necessary for success. 坚忍不拔是成功所必需的。
- It is necessary for us to net the currant bushes . 我们有必要用网盖上红醋栗树。
- Nothing is so necessary for travelers as languages. 外出旅行，语言最要紧。
- Morning exercise is good for health. 早锻炼有益健康。
- Be it necessary for us to look into the matter? 有没有必要调查这件事?
- What nutrients are necessary for a balanced diet? 均衡饮食必要的营养成分有哪些?
- Is it necessary for me to buy a pair of waterskis? 我有必要买双滑水屐吗?
