Crop rotation is one of the oldest and most effective soil fertility control strategies.

作物轮作是调节土壤肥力最古老和最有式之一。

We still have to put in all the control strategies that we know we're working, including hand washing, mask wearing and physical distancing.

我们仍然需要采取所有我们知道有制策，包括洗手、戴口罩和保持社交距离。

Today, scientists are on a quest for alternative pest control strategies that balance the demands of food production with environmental concerns.

今天，科学家们正在寻求替代制策，以平衡粮食生产需求与环境问题。

For example, in 2014, during early stages of an Ebola outbreak in Liberia, the recommended infection prevention and control strategies for healthcare facilities weren't made clear at the national level.

例如，2014 年，在利比里亚埃博拉疫情爆发早期阶段，国家层面没有明确为医疗机构推荐感染预防和制策。