For several decades, although common pressing plates method has made some improvements, great breakthrough has not appeared yet.
在这几十年中，虽然一般压片法已经有了一些改进，但是并没有出现很大的突破。
For several decades, although common pressing plates method has made some improvements, great breakthrough has not appeared yet.
在这几十年中，虽然一般压片法已经有了一些改进，但是并没有出现很大的突破。
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