Musical notation was conceived for the C major scale and each line and space represents a note in this scale.
乐谱为C大音阶而构思，在这个音阶中的每一个线和间都代表一个音符。
《柯林斯英汉双解大词典》
2
For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre.
每题都有对应标记的A、B、C和D四个选项，请选择最佳选项并在答题卡2的相应字母中间划横线。
3
The LSL documentation is useful even to someone who's never going to touch a C++ compiler or a line of source and who just uses prebuilt downloads of the viewer.
即使对于那些从来都不会涉及 C++ 编译器或一行源代码以及那些使用预先编译好的查看器下载版本的用户来说，LSL 文档也会非常有用。