... twice a week一周两次 be careful with sth重视某事 spend…(in)doing sth花费……做某事 ...
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... be careful of/about sb./sth 小心或在意某人或某物 be careful with sth 做某事或处理某物时小心 carefully ad. 仔细地，小心地 ...
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... 6. from now on 从现在开始 7. be careful with sth 小心对待某物 8. talk to sb 与某人交谈 ...
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