1.Vietnam and China agreed to normalize diplomatic relations in 1991.

1.1991年越南和中国同意常外交关系。

2.The results of tests show that the new subsampling method outperforms other subsampling methods in less extrema and convergence performance of the normalized mutual information.

2.实验结果表明，新抽样方法可以有效地减少局部极值点，提高归一化互信息测度的收敛性能。

3.The oils were analyzed by GC-MS and percentages were obtained by normalized peak areas, where main components are nootkatone, D-limonene, osthole, cis-linaloloxide, furfural, and trans.

3.用气相色-质(GC-MS)联用技术分析,鉴定出主要成分为圆柚酮、D-柠檬烯、王草素、顺式-芳樟醇氧化物、糠醛、反式-芳樟醇氧化物。

4.What is obtained with the forging waste heat normalizing and controlled cooling technique is the coarse stable structure in a 20CrMnTi gear, but its cutability is good.

4.余热和常规的理后，再经同样的工艺进行渗碳、淬和回理，试验证明：其渗层和心部的组织、晶粒度及机械性能均相同。