動詞 require:

1. require as useful, just, or proper
   同義詞：necessitate, ask, postulate, need, require, take, involve, call for, demand
2. consider obligatory; request and expect
   同義詞：ask, require, expect
3. make someone do something
   同義詞：command, require, compel
4. have need of
   同義詞：want, need, require

形容詞 required:

1. necessary for relief or supply
   同義詞：needed, needful, requisite
2. required by rule
   同義詞：compulsory, mandatory

1. Learning to walk again after his accident required great patience.
   他出事后重新學(xué)習(xí)走路要有極大的毅力。
2. His work does not reach the standard required.
   他的工作成績達(dá)不到要求。
3. I did more work than required.
   我做了比所被要求的來得更多的工作。
4. All passengers are required to show their tickets.
   所有乘客都必須出示車票。
5. We are required by environment protecting department to use anthracite.
   環(huán)保部門要求我們使用無煙煤。
6. The ships required the protection of naval and air power.
   船只本身需要海軍和空軍的保護(hù)。
7. The order No.105 is so urgently required that we have to ask you to speed up shipment.
   第105號訂單所訂貨物我們要急用，請你們加快裝船速度。
8. 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)非必需的是正常的運轉(zhuǎn)所需要的物質(zhì)的，但因為機(jī)體有從其它營養(yǎng)成分合成它的能力，因此不需要被包括在日常的食物中的

re.quired

adj.Abbr. req.,reqd.（形容詞）縮寫 req.,reqd.
Needed; essential.
必需的；必不可少的
Obligatory:
必要的：
例句：
required reading.
必讀物