There have been calls for tougher controls/restrictions on what online retailers are allowed to sell.一直有人呼吁要对网上零售商出售的商品种类严加控制／限制。He tried to impose strict controls on the media.他试图对媒体严加控制。The government has promised to keep a tight rein on public spending.政府承诺要对公共支出严加控制。