New words：

firm [fɜrm]
n.公司；企业；事务所；商行
adj.坚固的；稳固的；坚定的；坚决的

Sample Sentences：

The rope is firm enough to hold the heavy box.
His father works in a firm that sells computers.
He is one of the firmest supporters of this policy.
This firm was founded by two young men five years ago.

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