There has been so much controversy and back and forth on this over many years.
许多年来，这一问题引发了巨大的争议，出现了许多反复。
If Baby wags her tail high and back and forth, she's in her "happy place".
如果小宝尾巴摇得高高地还前后晃，她就是高兴的。
Vectors can be cast between vectors of other types, and back-and-forth between the vector types and the special quad type, but none of these casts perform any data conversion.
向量可以在其他类型的向量之间进行转换，并在向量类型和特殊的quad类型之间反复进行转换，不过这些类型转换都不能执行任何数据转换。
Vectors can be cast between vectors of other types, and back-and-forth between the vector types and the special quad type, but none of these casts perform any data conversion.
向量可以在其他类型的向量之间进行转换，并在向量类型和特殊的quad类型之间反复进行转换，不过这些类型转换都不能执行任何数据转换。
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