必须的

Milk and dairy products are rich in vitamin D and calcium, substances essential for building and maintaining bones.

牛奶和奶制品富含维生素 D 和钙，这是骨骼生长和维持所必须的物质。

It is necessary that the demon should depart, and not I.

恶恶鬼离开是必须的，而不是我。

It is necessary that we help those disabled people.

我们帮助那些残疾人是必须的。

Renting mobile and disc jockey services is a must for any event.

租用移动和唱片骑师服务是必须的任何活动。

For him, unity was necessary for an effective resistance to Britain.

对他来讲，团结对于有效地反英斗争来说是必须的。

In this field, the students should have a good grasp of the technological foundational theory including: Mechanics, Mechanical Engineering, Electrotechnics, Electronics etc..

比较系统地掌握本专业必须的技术基础理论，主要是力学理论，机械学理论，电工电子学基础理论

Oh, Wilderness were Paradise enow!

对自己残忍，那是必须的。

Milk and dairy products are rich in vitamin D and calcium, substances essen tial for building and maintaining bones.

牛奶和奶制品富含维生素D和钙，这是骨骼生长和维持所必须的物质。

It is necessary to warn as well as evangelize.

既警告又宣讲福音是必须的。

Much better to get to the action more quickly and then fill in background as needed.

更快地进入情节，然后再补充必须的背景会好得多。

No clear conclusions can be made about the predictie alidity of specific measures, they found, except for criteria for the underuse of drugs for cardioascular disease.

除了心血管病不合理用药标准外，对于特定评价方法的预测效度没有明确的结论。

The third and last is that almost all of them, being infinite in number, have been impostures, and by idle and crafty brains merely contrived and feigned after the event past.

第三、即最后一点是：几乎所有这些不胜枚举的预言都是欺人之谈，都是在事件过后由无聊而狡猾的脑筋推测与凭空捏造的。