And if there are multiple light sources, why does each object only cast one shadow?
而且如果说有多个光源的话，为什么每个物体只有一个影子呢？
This was already cast as the correct class of product object, so you do not need to cast it yourself.
这时产品对象已经被转换成为了正确的类，所以您不需要自己再次的转换它。
The remedy is to change the code to cast correctly to the right object.
补救方法是更改代码，以强制转换为正确的对象。
The invoke() method returns an Object, hence the cast to a String.
invoke()方法返回一个Object，所以要转换成 String。
UniversalDaoiBatis: a class that requires you to cast to the specific object type.
这个类需要申明为一个特定的对象类型。
Likewise, you can cast the returned object to an appropriate COM interface.
同样，也可以将返回的对象强制转换为适当的COM接口。
An anonymous type cannot be cast to any interface or type except for object.
匿名型别不可转换成物件以外的任何介面或型别。
This method will return a Object, you can cast it to its original type later.
这个方法将返回一个对象，你可以在之后使用形态转换将该对象转为原始类型。
This method will return a Object, you can cast it to its original type later.
这个方法将返回一个对象，你可以在之后使用形态转换将该对象转为原始类型。
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