The rooting rate of test-tube plantlets could be increased obviously by seedling step-drilling, auxin treatment, suitable medium and environment conditions, control of bacterium and fungi, etc.

通过提供过渡炼苗，生长素处理，适宜的介质与环境条件以及防止杂菌滋生等措施，可显著提高试管苗瓶外生根效率。

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As background, hydraulic fracturing is a multi-step process commonly used in oil and natural gas drilling to bolster eventual production from wells.

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The next step is to try to staunch the flow proper with drilling mud, a mixture of water and clay minerals.

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