xenomorphic grain

例句：

1. 1. The aliens have landed on the moon and are exploring it.
   外星人已经登陆月球并正在探索它。
2. 2.The foreign policy of this country is to maintain peace and stability in the region.
   这个国家的外交政策是维护该地区的和平与稳定。
3. 3. The alien species has been discovered in the deep ocean.
   在深海中发现了这种外星物种。