The foam wasn't a very good insulator (in other words, not useful to him at the time), but he was impressed by how light and strong it was.

这种泡沫的隔热能力并不是很好(换句话说，在当时并不能让他满意)，但是他却发现这种泡沫材料非常轻又非常坚韧。

youdao

MOST cells are transparent—in other words, they are not very good at reflecting or absorbing light. To look at them under a microscope thus requires trickery.

大多数细胞都是透明的——换句话说，它们都不易于反射或吸收光线，所以在显微镜下观察细胞需要一些技巧，但这些技巧往往会杀死细胞，而且即使某些方法能够观察到活细胞，也只能看到其切片图，而非三维全貌。

youdao

Even now we are still not very good at English words learning.

即使到了现在，我们依然对学习英语单词不是很入门。

youdao

In other words, while markets may not be very good at getting people health insurance, they can be quite good at curbing growth rates.

FORBES: Market Reforms Could Help Slow Healthcare Spending Growth