例句與造句

1. However , often during the takeoffs and landings , an aircraft is operating at approximate speeds of 150 mph or less
   然而通常在起降過程中，飛機(jī)的飛行速度不會超過150英里每小時(shí)。
2. In twt , rf field extracts energy from the electron beam . the electron beam must interact with the traveling wave field at the approximate speed , so that the electronic efficiency is much lower
   在行波管中,電子交給高頻場動能,而電子注與行波場的相互作用又要求維持同步條件,因而電子的效率比較低。
3. It's difficult to find approximate speed in a sentence. 用approximate speed造句挺難的