是松，loosen 意思是松開、解開，例如：

1.The military regime has not loosened its hold on power.軍事政權(quán)尚未放松對權(quán)力的控制。

2.Many business groups have been pressing the Federal Reserve to loosen interest rates.不少企業(yè)集團(tuán)一直在向聯(lián)邦儲備委員會施壓，要求其放松利率管制。

3.First loosen the nuts, then take off the wheel.先松開螺母，然后卸下車輪。