我们的研究有一定的局限性：（1）动脉导管部位不是随机分配的；
Our study has certain limitations: (1) Arterial catheter access was not randomly assigned;
这些玻璃导管能够让研究者在数周或是数月后重新观察同样部位的深部大脑。
The guide tubes allow researchers to return to exactly the same location of the deep brain repeatedly over weeks or months.
每个部件的整个重量由它的表面支撑，比较厚重的部位让人联想起承受大部分重量的导管结构。
The entire weight of each object is supported by its skin, with thicker areas that are reminiscent of natural vascular structures bearing most of the load.
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