Terminology research also takes time and effort, but that's a distant second in terms of difficulty.
研究术语同样要投入时间和精力,但对于难度来说,那实在是太次要的一点了。
They also have difficulty with stairs and descend feet-first.
他们上下楼梯也有困难,下楼时,用脚先下楼。
And the Pentagon spokesman, Bryan Whitman, says the bombing also illustrates the difficulty of preventing such attacks, even in a secured area.
五角大楼发言人惠特曼说,爆炸也说明防范类似的袭击有多么困难,即使在安全地区。
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