Because they cannot verbalize or fill out questionnaires, indirect techniques of naturalistic observation are used as the primary means of determining what infants can see, hear, feel, and so forth.

由于婴儿不能用语言表达或填写调查问卷，自然观察法的间接技巧被用来作为判断他们能看到、听到、感觉到什么等等的主要手段。

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Don't rely on finalizers as the primary means of releasing resources.

不要依赖于终结器作为释放资源的主要方式。

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The use of the class as the primary means of abstraction is key to object-oriented framework design.

作为抽象的主要方法，类的使用在面向对象框架设计中是很关键的。

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But by the early 1950s, Social Security emerged as the primary means of helping the elderly.

CNN: Health care will be an Obama legacy

Unlike Tea Partiers, politics is not seen as the primary means to change for First Globals.

FORBES: The Left Brewing Its Own Tea

As one factor among many, test scores can provide useful data, but as the primary means of evaluating teachers test scores are too unreliable.

FORBES: New York City to Roll Out New Tests to Rate Teachers