But the system has also encouraged farmers to alter time-honored crop rotation practices and the mix of herbicides that previously had kept weeds in check.

但是该体系鼓励农民改变长期以来的轮作制度和混合使用除草剂，在以前这些方法很好的控制了杂草。

youdao

You can either set the table property at table creation time, or alter it at a later time.

可以在创建表时就设置该表属性，也可以在稍后的时间进行修改。

youdao

Alternatively, the following ALTER command used at a later time achieves the same effect.

此外，在稍后的时间使用以下ALTER命令也可以达到同样的效果。

youdao

The war in Iraq illustrated the simple truth that national alliances shift and alter with time and events.

FORBES: Readers Say

Instead scientists and doctors are looking deeper at what is going wrong inside cancerous cells - a tumour can have 100, 000 genetic mutations and these alter over time.

BBC: Mass cancer mapping centre opens

For example, the act of remembering is a bit like a computer reading a location and rewriting the information at the same time, but a computer can rewrite the exact data that was there whereas humans alter it a bit each time they remember.

FORBES: Density Of Meaning: Creation As The Flip Side Of Memory