经过彻底的调查，许多专家现在认为，这条轨迹是一条普通的喷气式飞机尾迹。
After a thorough investigation, many experts now believe that the streak was a run-of-the-mill jet aircraft contrail.
他的礼物通常从一条普通的工作领带到一把烧烤铲——所有这些都可以让父亲感到快乐。
His gifts usually range from a simple tie for work to a new spatula for the grill—all of which can make dad very happy.
这可不是一条普通的鱼，它可是整个大海里最美丽的鱼呀！
Not just an ordinary fish, but the most beautiful fish in the entire ocean.
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