For retailers, who last year took in 24 percent of their revenue between Thanksgiving and Christmas, the cautious approach is coming at a crucial time.

【词语解释】

take in：收入；进账

revenue：收益；岁入（指一年的收入）

cautious approach：谨慎的应对方法

at a crucial time：在关健时刻

【翻译】去年从感恩节到圣诞节期间，零售业的收入占全年的24 %，现在已到了采取谨慎应对办法的关健时刻。

the cautious approach is coming at a crucial time：字面意思“谨慎的应对方法将在关键时刻到来。”言外之意就是：Now is a crucial time when they should take the cautious approach.