We should clarify the legal relations among lessor, lessee and sub-lessee in terms of theory in the two cases.

在这两种情形下，出租人、承租人、次承租人相互间的法律关系如何，理论上均应阐明。

youdao

Party b, who intends to sublet the said house shall sign, in accordance with the relevant regulations, a sublease contract with the sub-lessee.

乙方转租该房屋，应按规定与接受转租方订立书面的转租合同。

youdao

The Lessee shall not sub-let the building to any other persons, except with the prior written approval of the Lessor.

除非事先有出租人的书面许可，承租人不得把该房再出租给其他任何人。㵱。

youdao