Prodan
氟硅酸钠
🗣️ 情景例句
Lacks confidence and poise is nervous and ill at ease.
信心不足，不够自信，精神紧张，心神不定。
She is a reliable assistant.
她是个可信赖的助手。
Earlier, we were infants and young children, and consequently more vulnerable;
再早一些，我们是幼儿和小孩子，身体较脆弱；