Similarities
相似之处
进化到现在
Frigate和Destroyer的功能几乎重叠
比如，都有快速机动性（quick maneuverability）
都有一定的防空、反舰、反潜能力
可保护大型舰艇（如航空母舰）抵御海陆空威胁
（Escort(护航) and protect larger vessels from air, surface and underwater threats）
都是多功能舰艇（multi-role vessel）
Differences
不同之处
“The key distinction between frigates and destroyers is size and, by extension, function,” says Dr Sidharth Kaushal, a research fellow at the Royal United Services Institute for Defence and Security Studies.
