单词:rough surfaced blade
单词:rough surfaced blade 相关文章
Why do golf balls have dimples(酒窝, 涟漪)?So that they look cute? NO! Because the dimples maximize the distance golf balls travel. Dimpled balls travel up to four times farther than smooth-surfac
Bladeless Wind Generator Safe for Birds Wind turbines are tall structures with large blades used to produce electricity. They are useful sources of low-cost, renewable energy. But they can also be deadly to birds and bats. The turbines large blades t
Bird-friendly Bladeless Wind Turbine Mimics Nature Energy created by conventional three-blade wind turbines is cheap, sustainable and pollution-free. But according to current estimates, the devices' fast-moving blades kill up to 300,000 birds annuall
DAVID GREENE, HOST: All right. Now, in Helsinki yesterday, Presidents Trump and Putin also embraced restarting stalled arms control talks. For all the bad blood between the U.S. and Russia, those two nations still inspect one another's vast nuclear a
1. Civil rights leaders are calling for the creation of a citizens review board in North Charleston, South Carolina. NAACP leaders say they want the board to look into complaints of police brutality. The demand's come after a video surfaced of a whit
Doubtless they thought his brother's war was none of his concern. 可想而知,他们一定是认为他兄弟的战争与他无关。 It troubled him more than he could say. 然而这却比其他所有事更教他烦心。 Robb was marching and he