Aerotechnics
航空技術
??? 情景例句
She's a terrific person.
她人很好。
After forty years teaching English he thinks it's time to call it a day.
他教英語四十年，認為該退休了。
Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.
某些大公司進行的研究屬于一般和基礎性的研究。因此不保密對他們才有利。