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- 你查询的单词是:required ([ ri'kwaiəd ])
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- 解释: 必需的
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- 例子: 1. Being a substance that is required for normal functioning but does not need to be included in the diet because of the body's ability to synthesize it from other nutrients.
(氨基酸)非必需的是正常的运转所需要的物质的,但因为机体有从其它营养成分合成它的能力,因此不需要被包括在日常的食物中的
2. The ships required the protection of naval and air power.
船只本身需要海军和空军的保护。
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