Translator's use of translation units varies in inverse proportion to the difficulty of the translation task.
译者的翻译单位并非固定不变，其大小与翻译任务难度成反比。
Inverse synthetic aperture radar (ISAR) imaging of non-cooperative maneuvering multi-target is a challenging task due to its time-varying orientation and the relative motion among targets.
非合作的机动多目标相对于雷达射线的姿态是时变的，而且目标间可能存在相对运动，给逆合成孔径雷达(ISAR)成像造成较大困难。
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