They sound all like defensive systems, too.

听起来这些也是防御系统。

Millions of South Korean citizens and U.S.-South Korea combined forces are now better protected by this fully defensive system.

上千万韩国市民和美韩联军因这个全面防御体系的存在而得到了更好的保护。

And, since they're so fast, they're difficult if not impossible to deflect with conventional defensive systems.

而且，由于它们的速度如此之快，即使不是不可能，也很难用传统的防御系统来偏转。

We do know the defensive systems they do have all pointed toward Yemen because the Saudis are embroiled now in a fight with the Houthi rebels in Yemen.

我们知道，他们已有的防御系统都指向也门，因为沙特目前卷入了与也门胡塞武装的斗争中。