Preoxidation
预氧化
🗣️ 情景例句
I major in English and minor in French.
我主修英语，副修法语。
His heart swelled with gratitude to her.
他心中充满着对她的感激之情。
An enterprise has to incur certain costs and expenses in order to stay in business.
一个企业为了继续经营，不得不支出一定的费用和开销。