Software testing is time-consuming and hard sledding.
软件测试是费时费力的。
Natural water retting has the weak points of long retting time, hard sledding, unstable quality and water pollution.
天然水沤麻存在费工、费时、劳动强度大、质量不稳定、污染环境等缺点。
Natural water retting has the weak points of long retting time, hard sledding, unstable quality and water pollution.
天然水沤麻存在费工、费时、劳动强度大、质量不稳定、污染环境等缺点。
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