They hold only one piece of data: a string, a number, the undefined value, a reference to another variable.
它只保存一段数据：一个字符串、一个数字、未定义的值以及对另一个变量的引用。
The sole flapped off one boot, and he tied it to the upper with a piece of string from his pack.
一只靴的底脱落了，他只好从背囊上扯下一条绳子，把靴底跟靴面绑紧。
Today, I was teasing my cat with a piece of string when suddenly my phone rang. I answered it with one hand and put the string down with the other onto my lap.
今天，我拿一段绳子逗我的猫玩，突然我的电话响了，我一个手接电话，一手把绳子放在我的膝盖上。
Today, I was teasing my cat with a piece of string when suddenly my phone rang. I answered it with one hand and put the string down with the other onto my lap.
今天，我拿一段绳子逗我的猫玩，突然我的电话响了，我一个手接电话，一手把绳子放在我的膝盖上。
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