即使有这种树的大小只有5%或更少的建设所产生的木材将成为飞机质量的必要的。
Even with this size tree only 5% or less of the resulting lumber will be of the quality necessary for aircraft construction.
体型和质量相当于航天飞机的飞行器制造的两个音爆则非常容易区分，人们经常很容易地听到两次响声。
Sonic booms created by vehicles the size and mass of the space shuttle are very distinguishable and two distinct booms are easily heard.
伊朗的民用航空大都是由一些质量较次，年久失修的飞机组成。
Iran's civil fleet is made up of planes in poor condition due to their old age and lack of maintenance.
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