| 摘要 |
<p>Disclosed herein is a jet propulsion unit (14) comprising a housing (41) including a wall (43) defining a water tunnel having therein a water outlet port (71), and a recess (81) located in the wall (43) defining the tunnel and in surrounding relation to the port (71) and a screen (83) located in the recess (81) and extending across the port (71) and in flush relation to the wall (43) defining the tunnel.</p> |
