据南丹麦大学的埃尔维斯·格波·徐介绍,一次性口罩是塑料制品。
According to Elvis Genbo Xu from the University of Southern Denmark, disposable masks are plastic products.
“增长是好事,但未见得足以改善营养”,作者:奥利维尔·埃克,克莱门斯·布雷·辛格,卡尔·波夫。
Growth is good, but not enough to improve nutrition ", by Olivier Ecker, Clemens Breisinger and Karl Pauw."
指出一维单原子链的格波解是由于采用了循环边界条件的结果。
The lattice wave solution of single atomic chain only results from the cyclic boundary condition.
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