The Ptolemies are easier to keep straight because they tended to all be named Ptolemy.

托勒密家族比较容易区分，因为他们都叫托勒密。

youdao

Just keep going in a straight line ; you can't miss it.

照直走，你不会找不到那地方的。

《牛津词典》

Keep back straight and bend knees.

背要直，只弯两膝。

youdao

Because if we can keep the alignment straight then the seals work fine. It's between the mating and de-mating that we get the misalignment problem,".

VOA: standard.2009.06.16

You can see that as you fill up your periodic table, it's very clear. But also we'll tell you a pneumonic device to keep that in mind, so you always remember and get the orbital energy straight.

在你们填周期表的时候，非常清楚但是我们也要告诉你们,一个策略去记住它，所以你们总是记得,并得到连续的轨道能量。

麻省理工公开课 - 化学原理课程节选

And you can use mnemonics to try to keep these straight I see the T as sort of a plus sign.

你可以使用记忆术来记清它们,我将T看成是加号。

麻省理工公开课 - 固态化学导论课程节选

That is a lot to keep straight over several years or decades.

WSJ: Tax Report: When Your Broker 'Outs' You

They just keep going straight up is the conclusion Google appears to want us to draw.

FORBES: Google's Big Problem They Don't Want You To Know About

He instructs runners to keep a straight upper body and a "crunch" going in their lower abdominal muscles.

NPR: Chi Runners Poised for Softer Landings