That is what they have done on other occasions.
它们在其它场合都是这样做的。
On other occasions an image can also be obtained on the object plane.
满足其它条件也能成像于物平面。
On the other hand, it might be appropriate to wear traditional clothes on special occasions.
另一方面，在某些特定的场合，我们适合穿传统服装。
On the other hand, it might be appropriate to wear traditional clothes on special occasions.
另一方面，在某些特定的场合，我们适合穿传统服装。
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