These can be handled safely provided that their properties are understood and adequate precautions taken.
假如了解这些物质的性质并采取适当的措施,这是能够安全地使用和处理的.
In many cases, resizing operations can proceed smoothly; however, numerous stumbling blocks can cause problems for the unwary, or even for those who take adequate precautions.
很多情况下,调整操作一般都很顺利,然而,许多障碍都是粗心大意引起的,甚至对那些已经做了充分准备的人也不能避免。
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