ensure
to make something certain to happen
The airline is taking steps to ensure safety on its aircraft.航空公司正在採取措施以確保其航班的飛行安全。
The role of the police is to ensure (that) the law is obeyed.警察的職責就是確保法律得到遵守。
assure
to tell someone confidently that something is true, especially so that they do not worry
（尤指為消除其憂慮而）確定地對…說，向…保證，使確信；讓…放心
The unions assured the new owners of the workers' loyalty to the company.工會向新企業主保證，工人們對公司是忠誠的。
"Don't worry, your car will be ready tomorrow," the mechanic assured him.「別擔心，你的車明天就可以修好。」修理工向他保證。
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A According to Thomas Walden, exercise combined with dieting _______ weight loss better than alone does.
(A) ensures
(B) assures
(C) make sure
(D) insurance
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