uncommon [形容詞]珍しい、普通でない

1-C. Because of the lack of oxygen at such extreme heights, it is not uncommon for climbers to rely on bottled oxygen in their attempts to reach these highest peaks.Because of the lack of oxygen at such extreme heights, it is not uncommon for climbers to rely on bottled oxygen in their attempts to reach these highest peaks.  

原因から、不足のダヨ、酸素のダヨ、このような極端な高度でのダヨ、それ(形式主語)は、珍しいことではありません、登山者にとってダヨ、依存することがダヨ、容器入りの酸素にダヨ、彼らの挑戦においてダヨ、これらの最高の頂上に到達するためのダヨ。  

2-C. Deja vu, however, is not uncommon and has been the subject of scientific studies since the 19th century.Deja vu, however, is not uncommon and has been the subject of scientific studies since the 19th century.  

デジャブーは、しかし、珍しくありません、さらに、対象であり続けました、科学的研究のダヨ、19世紀以来ダヨ。  

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