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。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。