保证墙体有足够的养护时间（4～8周），并充分干燥，除去表面的灰浆渣和任何松动物质。
To ensure the conservation of the wall have enough time (4 to 8 weeks), and fully dry, remove surface residue and any loose mortar material.
从涂料干燥时间、硬度和表面张力出发，研究了这些基本性能对涂料耐沾污性的影响。
Effects of basic coating performance of stain resistance were studied in the light of drying time, hardness and surface tension of the coatings.
科学家也正在研究病毒在干燥表面或悬服液中可以生存多久，包括在粪便中的存活时间。
Scientists are also working to determine the amount of time the virus can survive in the environment on both dry surfaces and in suspension, including in faecal matter.
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