[ 2204阅读 ] 长难句分析

Posted 2023-02-23 we1less

In a countercurrent exchange system, the blood vessels carrying cooled blood from the flflippers run close enough to the blood vessels carrying warm blood from the body to pick up some heat from the warmer blood vessels; thus, the heat is transferred from the outgoing to the ingoing vessels before it reaches the flflipper itself.

---

If the pores are large, the water in them will exist as drops too heavy for surface tension to hold, and it will drain away; but if the pores are small enough, the water in them will exist as thin films, too light to overcome the force of surface tension holding them in place; then the water will be firmly held.

drain  v. 排出; （使）流干

films  n. 胶片; 薄层;

firmly  adv. 坚固地; 稳固地

---

The images produced by the camera obscura, a boxlike device that used a pinhole or lens to throw an image onto a ground-glass screen or a piece of white paper, were already familiar — the device had been much employed by topographical artists like the Italian painter Canaletto in his detailed views of the city of Venice.

obscura  暗盒

familiar  adj. 熟悉的; 通晓;

detailed  adj. 详细的，细致的