What is the main ingredient in chalkboard chalk?

粉笔的主要成分是什么？

Compare that to a black chalkboard, which is pretty dark.

拿一块黑板作比较，我们都知道黑板的颜色已经很深了。

She hates the sound of nails scratching on a chalkboard.

她讨厌指甲刮黑板的声音。

I have this chalkboard to-do list at home but only because I'm old school.

我家里有这么一块黑板，上面写着待办事项清单，但这只是因为我是个老古板。

Its surface is actually pretty dark, with about the same reflectivity as a chalkboard or asphalt.

它的表面其实非常暗淡，只有大约相当于黑板或者沥青的反射率。

Ten minutes down the road from Mariama Daffe's home, women write on a chalkboard at the local elementary school.

从马里亚玛·达菲家出来走路10分钟，有一所当地小学，妇女们在黑板上写字。

I mostly have whiteboards now and very, very few chalkboards because this sound is so aggravating.

我现在主要有白板， 黑板非常非常少，因为这种声音太烦人了。

It's so aggravating when people scratch a chalkboard with their nails.

当人们用指甲刮黑板时，情况会变得非常糟糕。

He lacks many materials usually found in schools, such as books, paper and chalkboards.

他缺少许多学校里常见的材料，例如书籍、纸张和黑板。

I also put an advanced Fourier system on the main hallway chalkboard.

走廊黑板上有高级傅立叶算式。

But do not alter anything on the chalkboard.

但是不要改动黑板上写的东西。

One day she was in her classroom and was writing on the chalkboard.

一天，她在教室里，正在黑板上写字。

We can do the extra credit problems on the calculus chalkboard.

可以在黑板上算微积分 获得额外学分。

This is the chalkboard wall that Skipper wanted so that she could express her moods.

这是Skipper想要的黑板墙，以便她可以表达自己的情绪。

Now let's begin with the first method: write important points on the chalkboard.

在黑板上写重点。

We could add a small whiteboard or chalkboard on the side of the table for taking notes or making reminders.

FPX：我们可以在桌子边上加一块小白板或黑板，用来做笔记或做提醒。

Affinity diagrams can be done on paper or a chalkboard, but a nice way to work with them is to use sticky notes.

关联图可以在纸上或黑板上完成，但使用便签也是一种不错的方法。

King George III had his own ornate microscope made of silver in 1770, and Einstein's chalkboard still features his hand-scrawled equations from 1931.

1770 年，乔治三世国王拥有自己的华丽银制显微镜，爱因斯坦的黑板上仍然保留着他 1931 年手写的方程式。

They could not wait to try it. He told them, " First, we need to work on the chalkboard before we can start the math."

她们等不及要用这片墙了。他告诉她们，“首先，在开始数学课之前，我们需要做黑板上的题。”

Back then, the restaurant felt daringly stark: whitewashed walls and concrete floors, drinks specials on chalkboards, a high-ceilinged dining room with white tablecloths and wooden chairs, no music.

当时，这家餐厅给人的感觉非常大胆张扬：粉刷成白色的墙壁和混凝土地面，黑板上写着特饮和特色菜，餐厅的天花板很高，餐桌铺着白色桌布，椅子是木质的，不放音乐。