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Meaning:
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a U-shaped wire that fastens material by piercing and bending; a major product, material, part, or item regularly used
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Example:
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Fruits and vegetables are
staples of a healthy diet.
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Meaning:
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to fasten with staples
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Example:
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Please
staple the pages of your report together.
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Meaning:
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chief, principal; needed or used regularly
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Example:
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Rice is a
staple crop in many Asian countries.