Software testing is time-consuming and hard sledding.
软件测试是费时费力的。
You could carve out by yourself, but that maybe take time and hard sledding, and would take on risk.
你可以自己创业，但那可能是既费时又费力，还得承担风险。
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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