FOCUS:

focus
Some adverbials are used to focus attention on one part of a sentence:
Paul regularly runs out of the nursery to play ball in a busy street; he has also run home by himself and was nearly hit by a lorry.
The writer is adding to the dangerous things that Paul has done, and the adverb also helps focus our attention. If we remove the word, the sentence is much weaker:
Paul regularly runs out of the nursery to play ball in a busy street; he has run home by himself and was nearly hit by a lorry.
Other examples of sentences with focusing adverbials are:
Utah, in particular, needs all the new employers it can find.
Only the flowers in the vase on the table in front of me seemed real.

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