但在可预见的未来，亚音速飞机的形状不会发生根本的改变。
But it is unlikely that the shape of subsonic aircraft will change radically in the foreseeable future.
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。
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.
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