無人機(jī)的普及將帶來效率的革命。
解釋：大樹不能生長在屋脊上，松柏不能生長在矮墻上。
雖然說是愛它，其實(shí)是害它；雖然說是為它擔(dān)憂，其實(shí)是與它為敵
You can't win unless you learn how to lose.
The concept of legal validity is crucial for understanding the nature of law.