NPR News:加拿大对美加征报复性关税 美加贸易战开打

重点讲解：
1. take effect 开始实施；生效；有效；
International sanctions were beginning to take effect.
国际制裁开始起作用了。
2. stand up to 对抗，抗争，抗拒(尤指比自己强的人)；
Women are now aware of their rights and are prepared to stand up to their employers.
女性目前已经认识到了自己的权利，随时准备和她们的雇主抗争。
3. under the guise of 假借，以…为幌子；
His speech presented racist ideas under the guise of nationalism.
他的讲话以民族主义为幌子宣扬种族主义思想。
4. up to a point 有一点；在一定程度上；
In the financial sector this is wise, up to a point.
在一定程度上，这种做法对金融业而言是明智的。