109 - cost, costly etc.
109.1 cost ( v. ) 價錢為
109.2 cost ( n. ) 花費, 費用, 價錢, 成本
How much does this book cost?
109.3 costly ( adj. ) 昂貴的, 造成重大損失的錯誤
Building this bridge has already been too costly in terms of lives ( = People have been killed while working on it )
109.4 -
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