And in mid 1980s, more attention was paid to climatic changes, and as a result of that, the research range expanded, methods were improved, and dating techniques more precise.

80年代中期以后，研究的内容侧重气候变化，研究区域不断扩大，方法不断完善，测年手段更趋精确。

youdao

And in mid 1980s, more attention was paid to climatic changes, and as a result of that, the research range expanded, methods were improved, and dating techniques more precise.

80年代中期以后，研究的内容侧重气候变化，研究区域不断扩大，方法不断完善，测年手段更趋精确。

youdao