1.Flat prices are freely negotiated between the parties involved, subject to the transfer of premium liability to new purchasers.
买卖双方可自由议定单位售价，但买家必须承担补缴地价的责任。
2.It is considered that thermodynamics is an involved subject.
人们以为热力学是一门复杂的学科。
3.It is considered that bioclimatology is an involved subject.
有人认为，生物气候学是一门复杂的学科。