But the visual question involves to person's subjective experience, the understanding and the expression way, thus appears especially complex and is difficult.
而视觉问题又牵扯到人的主观体验、理解和表达方式，因而显得尤为复杂和困难。
Manager Jean Fernandez said: "The ideal thing would be for him to stay another year but that appears difficult."
主教练让-费尔兰德兹说：“理想化的是他继续在欧赛尔再待一年，但是这看来很困难。”
Sometimes, in order to overcome these shortcomings to use bored piles and post-grouting pile, but bored piles are difficult to drilling in sand stratum, drill pipe sticking and dropping often appears;
有事为了克服以上缺点改用钻孔灌注桩和后压浆灌注桩，但灌注桩在砂土地层中也不易钻进，常出现卡钻、掉钻；
Sometimes, in order to overcome these shortcomings to use bored piles and post-grouting pile, but bored piles are difficult to drilling in sand stratum, drill pipe sticking and dropping often appears;
有事为了克服以上缺点改用钻孔灌注桩和后压浆灌注桩，但灌注桩在砂土地层中也不易钻进，常出现卡钻、掉钻；
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