But missile attacks on ships are rare, so it is difficult to know just how safe a ship really is-especially if an attacker launches a dozen or so missiles at once.

但舰船受到导弹攻击的案例非常少，因此很难判断一条战舰躲过导弹攻击的劫数有多大，特别是在攻击者一次发射十多枚导弹的情况下。

If the Chinese do succeed in creating a "carrier killer" version of the DF-21, the U. s. Navy can modify its Aegis anti-missile system to protect carriers against such attacks.

如果中国确实成功创造一个“航空母舰杀手”版本的DF - 21，美国海军能修改它的宙斯盾反导系统保护航空母舰免于此类攻击。