Firming
vt.& vi. 使坚固（firm的现在分词形式）
🗣️ 情景例句
I've put an X next to the place where you should sign.
我已在你该签名的地方后面标示了X。
You can have no more of the fox than the skin.
狐狸除了皮，旁的全无用。
for fear the agents of other firms should be able to trace the kind of research they are likely to be undertaking.
他们生怕别的公司的情报人员据此摸到他们可能要从事的某项科研项目。