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第六百三十八条 试用买卖的买受人在试用期内可以购买标的物，也可以拒绝购买。试用期限届满，买受人对是否购买标的物未作表示的，视为购买。
Article 638
A buyer to a sale on trial use may purchase or refuse to purchase the subject
matter within the period for trial use. Where, upon expiration of the period for
trial use, the buyer makes no indication as to whether to purchase it or not,
the buyer is deemed to have purchased the subject matter.
试用买卖的买受人在试用期内已经支付部分价款或者对标的物实施出卖、出租、设立担保物权等行为的，视为同意购买。
If a buyer to a sale on trial use has, within the period for the trial use,
already made partial payment or has sold, leased, created a security interest in
the subject matter, the buyer is deemed to have agreed to purchase it.
第六百三十九条 试用买卖的当事人对标的物使用费没有约定或者约定不明确的，出卖人无权请求买受人支付。
Article 639
Where there is no agreement between the parties to a sale on trial use on the
fee for the use of the subject matter, or the relevant agreement is unclear, the
seller has no right to request the buyer to pay such fee.
第六百四十条 标的物在试用期内毁损、灭失的风险由出卖人承担。
Article 640
The risks of destruction, damage, or loss of the subject matter shall be borne
by the seller within the period for the trial use.
第六百四十一条 当事人可以在买卖合同中约定买受人未履行支付价款或者其他义务的，标的物的所有权属于出卖人。
Article 641
The parties may agree in a sales contract that the seller retains the ownership
of the subject matter if the buyer fails to pay the price or perform other
obligations.
出卖人对标的物保留的所有权，未经登记，不得对抗善意第三人。
The ownership of the subject matter retained by a seller, without being
registered, may not be asserted against a bona fide third person.
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（请在使用前对文本的时效性进行确认，内容以全国人大、国务院等公报为准）