How environmental pollution affects the survival of the human species
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Writing two or more words (e.g. Rome Naples), the result shows images that contain either of the indicated words.
Using the “+” tool in front of two or more words (e.g. +Rome +Naples), the result shows images that contain both words.
Using the “-” tool in front of a word (e.g. +Rome -Naples), the result shows images that contain the word Rome but not the word Naples.
If you don’t know the exact word to search, you can use the “*” tool at the beginning or end of that word or in the middle (for example, if you write Rom*, the result shows images that contain the words Roma, Rome, Romulus etc.; if you write Rom*a the result shows images that contain the words Romagna, Romania, Romina etc.; if you write *oma, the result shows images that contain the words Roma, Romania, Toma, Boma, etc.).
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