第一和第二套管针活门定位在套管主体端盖内，并且各自在其中间部分具有开口。
First and second trocar valves are positioned within the cannula body end housing and each having an opening in a medial portion thereof.
由于纳米管能够吸入聚合胶，他们可以同时扮演金属针和线的角色。
Because the nanotubes drew glue into themselves, they could be used as both needles and threads.
纳米碳管的直径仅有一米的十亿分之一长，是最理想的金属针。
Carbon nanotubes, which are just billionths of a metre across, seemed the perfect needle.
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