direct survey的用法和樣例：
例句
- Use methods that permit direct investigation of the question.
使用直接調查研究問(wèn)題的研究方法。 - These direct investigations aim at addressing problems at a higher level by adopting a proactive and preventive approach.
進(jìn)行直接調查的目的，在于以積極主動(dòng)的態(tài)度，從較高層次著(zhù)手解決問(wèn)題。
