保护…免受(某种)危害,防止,防备 (cause to) be protected against (sth bad)
ensure against sth
You should ensure against loss of heat by having double glazing.
你应装双层玻璃以免散热。
ensure sb against sth/v-ing
There must be safety devices to ensure workers against accidents.
一定要有保护工人避免工伤事故的安全装置。
Vaccinations ensure one against diseases.
接种可以预防疾病。
We must ensure our children against contamination by bad ideas.
我们必须保护我们的儿童不受坏思想的侵蚀。
Carefulness ensures you against errors.
工作仔细可使你不出差错。
Proper clothing ensured us against suffering from the cold.
衣服穿得合适,我们就不会挨冻。