One company selling hydrochloric acid for etching cement floors reckoned that, because it was in gel form and could legally be washed down the drain, the product was environmentally friendly.
一家销售蚀刻水泥地盐酸的公司以为盐酸为胶液产品，可以被合法地冲进下水道，因此是环保产品。
Silica Gel - is silicon dioxide (SiO2), an amorphous form of silica.
硅胶-是二氧化硅(SiCO2)一种无固定形式的硅。
This powder form is more effective than a liquid spray because the nose tends to clear liquid sprays out, while the powder turns into a sticky gel and can be a much more potent vaccine.
这种粉末状的形式相较于液状喷雾更为有效，因为鼻腔容易清除液状喷雾，而粉末状疫苗剂型因可形成粘性的凝胶状而更为有效。
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