桶 (w)

(tǒng) bucket; (trash) can; barrel (of oil etc); CL:個|个[ge4],隻|只[zhi1]

桶口 (w)

(tǒngkǒu) bunghole; see 桶孔[tong3 kong3]

桶孔 (w)

(tǒngkǒng) bunghole

桶里射鱼 (w)

(tǒnglǐshèyú) to shoot fish in a barrel; to attempt sth too easy