即便没有高中文凭，一个黑人只要有求职意愿，他仍可能找到工作。并且水管工和电缆维修员这类体力活，薪酬还挺不错。
Even without a high-school diploma, a black man can probably find a job if he looks. And some manual jobs, such as plumber or cable technician, pay quite well.
他的观点是，在某种程度上二者均由运输物质的网络构成——公路，铁路，水路以及煤气管，污水管还有电缆线都在输送物质，动物血管和植物运输汁液的木质部、韧皮部也是如此。
Roads, railways, water and gas mains, sewage pipes and electricity cables all move things around. So do the blood vessels of animals and the sap-carrying xylem and phloem of plants.
适合于使用在往复运动的场合，能够对内置的电缆、油管、气管、水管等起到牵引和保护的作用。
Suitable for use in reciprocating motion situation, to the built-in cable, tubing, the trachea and conduit to wait have traction and protection.
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