1.dispense with 省掉，放弃使用

The new design dispenses with gears.

这种新设计不需要使用齿轮_Osn8p#Rw9YICe|(v。

2.date back to 回溯至

Predecessors of the cowboy date back to colonial times.

牛仔的祖先可以追溯到美国十三州殖民地时期F4l[fA,=^-mlOf[|D。

3.struggle to do 尽力做某事

Smaller Western Allies struggle to keep up.

那些规模较小的西方盟国也在努力跟上mmOTvti*HeV+[h;b8cM7。

4.economical 经济的

Buying in bulk is more economical than shopping for small quantities.

大批采购比少量购买更经济实惠y1vTOKKL4H*。