has not been difficult
并不困难
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The performance of LIBs has not been sufficient either, thereby difficult to apply to flexible consumer electronics including rollable displays.
ENGADGET: Korean scientists solve flexible battery riddle (video)
Perhaps recruiting traditional head teachers has been difficult, not because the job is too large, but because it is too small.
ECONOMIST: Using scarce head teachers more wisely
The healing process has been difficult but not impossible.
CNN: To Amanda, Gina and Michelle, from a survivor
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