String concatenation is a very common operation for programmers.对程序员而言，串拼接是一种很常见的运算。The Prime Minister needs a whole concatenation of circumstances to be in place before he can win a referendum.首相需要天时地利人和才能赢得全民公投。An extraordinary concatenation of factors led to his victory.一连串非同寻常的因素促成了他的胜利。