Avoid using the word “ensure” in any written form.
Why….??? Just don’t do it…
Well, why 小山？
Because ensure is to guarantee. Times when we can ensure a certain outcome are very rare, and never really exist unless we have total control over the situation. For example, “The CEO ensured us that the weather would be nice next weekend and we would have the company picnic.” The CEO may have looked at a weather report and concluded that based on the 50% chance of rain next weekend, that the weather would be accommodating. But he cant actually ensure – the weather is too large, complex, and unpredictable.
Its really best to avoid the word altogether. If you must use it, try to qualify it (e.g., “help ensure”, or, “work to ensure“).