它毕竟是一个简单的球窝关节；它有一定的载荷；它在有限的生命中需要可靠性；它必须包含适合工作环境的材料。
It is after all a simple ball and socket joint; it has certain loads imposed on it; it needs reliability over a defined life; it must contain materials suitable for the working environment.
研究金钱与幸福关系的经济学家们一致发现，在一定的收入之上，两者之间就并没有可靠的关联。
Economists who study the relationship between money and happiness have consistently found that, above a certain income, the two do not reliably correlate.
不一定，最新的研究将有助于你选择更好更可靠的基金。
Not necessarily, and new research shows how you can find better funds more reliably.
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