确证的

Without corroboration from forensic tests,it will be difficult to prove that the suspect is guilty.

没有法医化证就很难证明嫌疑犯有罪。

At least, do not have here any written corroborant (like letter of appointment, reward) of and so on.

至少，这里没有任何书面证(如聘书、酬谢之类)。

Three open crown ethers were synthesized for the first time by using parathesin as the terminal group.They were characterized by IR, 1HNMR ,MS and EA.

以对氨苯甲酸乙酯为端合成了3种酰胺型开链冠醚,并通过IR、~1HNMR、MS和元素分析证了它们结构。