Instead of having a hit count for each line, there is one for each basic block.
不是每一个代码行都有一个命中，而是每一个基本块都有一个命中。
2
An executable unit begins at the start of every basic block and at any instruction that corresponds to a lineof source code that is different than the previous instruction.
一个可执行的单元由每一个基本快开始，而与每行源代码相对应的指南与前面版本中的指南有所不同。
3
Basic applications can be written without a lineof code.