Methods, systems, and devices are described for synchronization in mesh satellite communications. A wide section 33 having a width dimension that is larger than the width dimension in the forward-backward direction of an anchor section 25 or the top-half section of a pushing member 29 is provided in the top-end section of at least one long hole 17a of a pair of long holes 17a, 17b that are provided in support plate sections 15b, 15c. The liquid carrier includes an aqueous medium comprising a polysaccharide.