Tā bǎ yí jiàn zhēnguì de lǐwù zèngsòng gěi le lǎoshī.
He presented a precious gift to his teacher.
Tips
usage
赠送 is more formal and polite than 送. Use it in business contexts (complimentary items), formal gift-giving, and donations. For casual 'give a gift to a friend,' just use 送.
