Soon the simple sequence of swellings of our early neural tube is followed by more complex events.在早期的神经管发生一系列膨胀的简单变化之后，随之而来的是更为复杂的活动。Club root causes swellings on the roots and the effects can range from a reduction in yields to total crop failure.根肿病会导致庄稼根部肿胀，从而导致减产甚至绝收。