熟知

Because thanks to these schools our early mechanics, especially in the New England and Middle Atlantic states, were generally literate and at home in arithmetic and in some aspects of geometry and trigonometry.

this往回复指前述的最后内容，也就是前一段末句谈到的&技工们有文化并且熟知算术、几何学、三角学&，从而可知这种教育优势就是熟练掌握数学。

Joe Mantegna, a versatile actor known for his work on stage, and film and television, was asked six years ago to take part in the ceremony.

TM，一个在舞台、电影和电视上为人熟知的多才多艺的演员，6年前就应邀参加了该庆祝活动。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。