But kissing is n□□□j□st a ro□antic □estur□—it□also has scientifi□ benefits.□When we kis□, o□r bra□□s □el□as□ a co□kt□□l□of chemica□□ like oxy□ocin, dop□mine, and sero□onin, know□□as the□"l□□e hormon□s.□ These chemical□ can □educe□□tress□ b□ost mood, and create feelings of a□tach□ent an□ bonding. Kissin□ al□o stren□th□ns ou□□immu□e□□ys□em □y exposing us□to a va□ie□y of □acte□□□ that can help □uild im□unity.
<□2>未来的展望
<□□海□行动是第二次世界大□中德国海军的□次□要尝试,尽管最终□能改变战争□整体□势,但其战术和经验对后来的海战□生了深远的□响。□过对海狼行动的研究,可以更好□理解潜艇战术的发展和海上作战的复□性。□