Greater knowledge and experience. If you had a choice, likely you would prefer to swim at a beach that is manned by lifeguards.
अगर आप समंदर में तैरने गए हैं, तो बेशक आप ऐसी जगह ही तैरना पसंद करेंगे जहाँ लाइफगार्ड हों ।