The most difficult, because as the plot is essentially predetermined, the writer needs skill to keep the momentum going, conjuring up original, complex characters and vivid scene-setting.
说它最困难，是因为故事的情节实际上已经预先设定好了，作家需要使用技巧来让故事向前推进，还要构思出原创的拥有复杂个性的角色与逼真的场景。
In many cases a drop ball, which lands in a profiled seat, will be used to shift the setting or activation mechanism at predetermined pressures.
在许多情形中，在预定压力下利用坐放在定型座上的落球使坐封机构或启动机构移位。
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