(dated)used for politeness before making a suggestion or expressing an intention
(旧)请允许我（提出建议或表达意图之前的礼貌语）
permit me to correct you.
请允许我纠正你的错误。
if the specified thing does not prevent one from doing something
如果…许可的话，如 果…允许的话
weather permitting, guests can dine outside on the veranda.
天气许可的话，客人可以在外面的阳台上就餐。