All 54 water samples have not been detected chloramphenicol residues.

在所有54个排污口水样品中，未检出氯霉素残留。

youdao

Moreover, corundum and periclase have not been detected in space dust before.

而且，此前在太空尘埃中还未侦测到刚玉和方镁石。

youdao

A modem has not been detected on your server. Please verify its installation in modem Control Panel before continuing.

在服务器上未检测到调制解调器。继续以前，请在“控制面板”的“调制解调器”中验证其安装。

youdao

Local officials in Nanjing said the virus had not been detected at its poultry markets, suggesting the trading ban is a precaution.

BBC: China closes Nanjing market over H7N9 bird flu

Truman says that people in those areas may eventually see a minor increase in risk, but so far leprosy has not been detected in animals on the East Coast.

CNN: Armadillos linked to leprosy in humans

The bomb also had no metal parts and probably would not have been detected by most airport security magnetometers.

BBC: Profile: Al-Qaeda 'bomb maker' Ibrahim al-Asiri