Dianion
二价阴离子
🗣️ 情景例句
The match was postponed to the following Saturday because of bad weather.
比赛因天气不好而延期到下个星期六进行。
She passed her competitive examination not without difficulty.
她好不容易才通过了答辩考试。
All produets have to go through five checks in the whole process.
所有产品在整个生产过程中得通过五道质量检查关。