two-wheeled vehicle, (especially) motorcycles / bicycle

以心伝心: telepathy, tacit understanding, communion of mind with mind, sympathy

open

open / start; beginning

(physics) a center of gravity; a centroid / (geometry) a centroid

barrel (metallic tube of a gun)

senior statesman / chief retainer

a target, a mark, a bullseye / an objective, an object (of doing something)

as far as ... is concerned; in terms of ...

undeveloped, untapped