英语语法分析

Asverin can be administered safely for a long duration without any sideeffect.

安嗽灵可长期服用，既安全又无副作用。

Asverin can be administered safely for a long duration without any side effect.

安嗽灵可长期服用，既安全又无副作用。

Asverin is provided with an expectorating action which has been never found in any conventional antitussitive agents so far available in the market.

安嗽灵的祛痰作用是迄今市场上可买到的常用镇咳药中前所未有的。