carry weight
If more people join us, that would carry more weight.
如果更多人加入我们，那将更有分量
=有分量.

catch on
Skateboarding caught on quickly.
滑板运动迅速流行起来。
=become popular; prevail流行

are they useful?

die hard
Indeed, old attitudes died hard.
的确，传统观念是很顽固的。
=take a long time in passing out of existence 顽固，死而不僵

If more people join us, that would carry more weight
carry weight

for good measure
Extra armor was added for good measure.
额外加装了一层甲板，以防万一。
＝in addition to the required amount 作为额外增补，保险起见

gear to
Tomorrow you'll begin training in a first aid system that gears specifically to the  
outdoors.
明天你们将开始急救系统训练，这个系统是专为户外运动设计的
＝vi. 适合

每天一看

呵呵，这么说俺做了件有意义的事了。

get it made
Unfortunately, among many artists, only a few will get it made. 不幸的是，在许多艺术家中，只有少数能够功成名就。
＝Succeed功成名就