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.