Sandcasting
n. 沙型铸造
🗣️ 情景例句
How'd you guess?
怎么晓得？
Fat hens lay few eggs.
肥鸡不下蛋。
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.
某些大公司进行的研究属于一般和基础性的研究。因此不保密对他们才有利。