Be very careful with this stuff, it can be dangerous if it isn't handled properly.

对这东西要小心，处理得不好可能会发生危险。

《柯林斯英汉双解大词典》

Cases which have not been handled properly should be put right.

应立即纠正那些处理不当的问题。

《新英汉大辞典》

This ensures that session management is handled properly.

这可以确保会话管理得到恰当的处理。

youdao

The president said information about Abdulmutallab including a warning from the suspect's father was not handled properly.

VOA: standard.2009.12.29

Louzado's case may or may not have been handled properly, but his story is typical.

CNN: Are some law firms cutting corners on foreclosures?

Some parishes were more careful than others in ensuring their funds were handled properly.

ECONOMIST: The Catholic church in America

The investigations and lawsuits will eventually peel back the layers and determine if the foreclosures have been handled properly.

CNN: Are some law firms cutting corners on foreclosures?