Sheets
小学 Primaryn. 被单；片材, 板片（sheet复数）
🗣️ 情景例句
That isn't necessary.
这倒不必。
The accident held the train up for an hour.
那事故使火车延误了一个小时。
Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.
反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展，