Then I got a call at work one morning from my neighbour; someone had broken into the property and it looked as though things were missing.
有一天早晨，我正在工作，收到了邻居打来的电话，有人破门而入我们的家，抢走了我们的财产，而且看起来被抢的东西还真不少。
The optional argument represents a fallback value, which is used if the named attribute is missing, or its value cannot be parsed into the given type or is invalid/out-of-range for the property.
可选参数表示应变值，如果命名属性用于失踪，或它的价值不能被解析到特定类型或属性是无效或超出范围。
The optional argument represents a fallback value, which is used if the named attribute is missing, or its value cannot be parsed into the given type or is invalid/out-of-range for the property.
可选参数表示应变值，如果命名属性用于失踪，或它的价值不能被解析到特定类型或属性是无效或超出范围。
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