effective at，例如：
1、But compared with other sedentary activities， like knitting， viewing TV may be especially effective at promoting unhealthy habits.不过，与其他久坐不动的行为比起来，比如织毛衣，看电视可能在促成不健康的习惯方面尤其有效。
2、This drug is very effective at the initial stage.这种药在初期很有效。
3、Research has also suggested that it can also make us more effective at our jobs.研究还指出，休息能让我们工作更高效。
