They're exercises to practice defensive moves against North Korea in case war on the peninsula ever breaks out again.

而进行军演的目的是为了防止朝鲜战争再次爆发。

Later, more established companies raced to add such patents to their files, if only as a defensive move against rivals that might beat them to the punch.

后来，更多的知名公司竞相添加这样的专利权，希望这样的防御性的行为可以先下手为强。

The Camarasaurus strains under the weight of his attackers, but in a defensive move, shakes them off, but not before the Allosaurus, using their large hand claws, have inflicted deep wounds in his flanks.

圆顶龙虽然在其攻击者的重压之下却仍然用防御性动作甩掉了它们，不过异特龙已经用其巨大的前爪在圆顶龙的身侧留下了深深的伤口。