Dave's ESL Cafe's Student Discussion Forums

[hiromi525]

Please take a look at the following paragraph from reading practice textbook for students.

If you know that wood will become wet, it can be protected. Wood can be treated with preservatives. For long term safety, the preservative should be put on under pressure. If the wood comes in touch with the ground, only pressure treatment will do the job. Some pieces of wood that only get wet from time to time can be treated to stop decay by brushing on a preservative. The correct chemical to use for treatment depends upon what the wood is used for. Some chemicals give off a terrible smell. These are not good for use indoors. Others cause paint to peel. You should mention what the wood is used for when you buy the preservative.

I don't understand the boldfaced sentences. I do understand the grammatical stracture but I don't visualize what the situation is, specially the spatial relevance between wood and the ground.

[pugachevV]

If a wooden post is set upon the ground, or more likely, is set into a hole dug into the ground, it should have a wood preservative forced into its fibres under high pressure to protect it from moisture or insect damage.

In touch means in contact with...