电子与氧原子碰撞的实验方面的工作是有限的。
The previous experimental work on atomic oxygen collision had been limited.
一种包装盒，该包装盒用于电子产品，以保护该电子产品免受外部碰撞。
A packing box for an electronic product to protect an electronic product from external impact.
一种包装盒，该包装盒用于电子产品，以保护该电子产品免受外部碰撞。
A packing box for an electronic product to protect an electronic product from external impact.
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