甜菜 tián cài 薄片 báo piàn 衰老 shuāilǎo 时期 shíqī ,钙 gài 对于 duìyú 防止 fángzhǐ 钾 jiǎ 离子 lí zǐ 丧失 sàngshī ,也 Yě 极其 jíqí 必要 bìyào .

Calcium is also necessary to prevent leakage of potassium during the aging of beet slices.

防止 fángzhǐ 啤酒 píjiǔ 变 biàn 坏 huài 的 de 主要 zhǔyào 方法 fāngfǎ 是 shì 用 yòng 纯 chún 酵母菌 jiào mǔ jūn 株 zhū 发酵 fā jiào .

The principal methods of avoiding spoilage are the use of pure yeast strains as starters.

镀 dù 锌 xīn 层 céng 是 shì 用 yòng 来 lái 防止 fángzhǐ 钢铁 gāngtiě 生锈 shēngxiù 的 de .

A zinc coating is applied to the steel for rust protection.

用 yòng 木板 mù bǎn 封 Fēng 好 hǎo 窗户 chuānghu ,防止 fángzhǐ 盗贼 dào zéi 进入 jìn rù .

The windows are boarded up to prevent the thieves from breaking in.