铃声

The sleigh bells jingled,andthe clouds carried snowflakes in them,but wherever a sun－beam burst through them,it announced that spring wasnear.

雪橇的铃声在丁当地响着；云块载着雪花。但是只要太阳露出几丝光线，人们就可以知道春天快要到来了。

Shige, whose cellphone rings to the tune of "Amazing Grace," though he is not religious.

尽管他并非宗教人士，他的手机铃声是&天赐恩宠&的音乐。

As soon as the bell rang,all the students ran to their blackboards to write something.

一上课铃声，学生们跑到教室内外一块块小黑板前开始写。

Software Description: About Able MIDI Editor, Compose your own ringtone, melody or complete arrangement with Able MIDI Editor which is based on the piano roll interface.

Able MIDI Editor 使用基于钢琴滚动界面的Able MIDI Editor软件编写你自己的铃声、旋律或者完整的序列。

Lay a ring of students into the classroom.

一躺到铃声，学生冲进了教室。

How many of you have read about Pavlov and his dogs and the bell, and all that stuff?...

你们有多少人看过巴甫洛夫和他的狗和铃声，等？

But the added advantage here is that, with a names ringtone, it brings customisation and personalisation a step further.

但好处是，随着铃声的名字，它带给定制和个性化了一步。

They are personalised ringtones that you can download to your mobile phone.

他们是个人铃声，你可以下载到手机。

If you prefer to look at a wider variety of ringtones, you can download them directly to your phone from several sources, using either a scrollable menu or choosing a numerical code linked to the ringtone you want.

如果你喜欢看各种类型的ringtones，你可以直接下载你的电话的几个来源，选用了scrollable菜单选择一个数值或代码连接到你想要铃声。

Pressure waves from continuous vibration look more like this

另一个声波的类型是周期波，当你击打一个铃时，击打下去的那一个瞬间跟拍手有一点相像，声音由铃的振动产生，当铃持续发出声音时，它的震动是以一个特别的频率进行的，这个频率与铃的大小和形状有关，而这个振动造成了铃周围的空气也以相同的频率振动，这使得铃声透过空气的压力波传递到更远的地方，以声音的既有速度进行，持续震动的压力波看起来跟以下这个图很像

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。