中空に形成

US20170106499(特表2017-512668)
"15. A water-abrasive suspension cutting facility according to claim 1, further comprising an abrasive agent reservoir with an exit and a movable closure element arranged in the exit, wherein the lock chamber is connected via the entry side shut-off element to the exit of the abrasive agent reservoir, wherein said closure element has a hollow configuration（中空に形成）that is open to an upper and to a lower end, wherein the closure element lower end closes the exit and with upper end extends beyond a maximal filling level for the abrasive agent."

US20170203163(特表2017-523894)
(Ab)
"The present invention relates to a ball-striking device (1), in particular a tennis, squash, or badminton racket, having a head frame (2), which comprises a striking surface, is of a hollow design（中空に形成）, and is produced from plastic, in particular from a fiber-reinforced plastic, and a shaft formed thereon with grip, wherein the striking surface (12) is defined by at least one string (8)"

US20160272284(特表2016-538477)
"10. Support structure according to claim 1, characterized in that the support element (9) has a hollow design（中空に形成）for a buoyancy function."

US9744334(特表2015-532189)
"Preferably, the shaping part is configured to be hollow（中空に形成）in the longitudinal direction of the two hollow bodies. In this way, it is possible to make do with a particularly simple shaping part, which can furthermore be configured to be cylindrical in its longitudinal direction."

form to be hollow
having a hollow form/shape