On the other hand, dead, unused code only clutters a program and makes it harder to read and understand, so delete it.
另一方面，无效的，废弃的代码只会使程序变得拥挤不堪，难于阅读和理解，所以还是删掉的好。
2
A programmable read-only memory microchip (PROM) serves to store the initial start-up program for a computer system and is built to withstand the conditions present in outer space.
可编程只读存储芯片用于存储计算机系统的初始启动程序，它被设计成可以承受目前外太空的环境状况。
3
In a thread-safe program, only one writing thread can modify the variable; other threads can read the up-to-date value by declaring the variable volatile.