  We observed the high-mass star-forming core G336.01-0.82 at 1.3 mm and 0.05''
(~150 au) angular resolution with the Atacama Large Millimeter/submillimeter
Array (ALMA) as part of the Digging into the Interior of Hot Cores with ALMA
(DIHCA) survey. These high-resolution observations reveal two spiral streamers
feeding a circumstellar disk at opposite sides in great detail. Molecular line
emission from CH$_3$OH shows velocity gradients along the streamers consistent
with infall. Similarly, a flattened envelope model with rotation and infall
implies a mass larger than 10 M$_\odot$ for the central source and a
centrifugal barrier of 300 au. The location of the centrifugal barrier is
consistent with local peaks in the continuum emission. We argue that gas
brought by the spiral streamers is accumulating at the centrifugal barrier,
which can result in future accretion burst events. A total high infall rate of
~$4\times10^{-4}$ M$_\odot$ yr$^{-1}$ is derived by matching models to the
observed velocity gradient along the streamers. Their contribution account for
20-50% the global infall rate of the core, indicating streamers play an
important role in the formation of high-mass stars.
