Is it a clock or a clock? Which one is right?

Sitting is a verb, and left is usually used as a noun or quantifier, so it should be a bell, and left is right.

Baidu Encyclopedia's explanation of "sitting";

1, the ancients knelt on their knees and rested on their hips, which is their original meaning. Later, it usually means touching their hips and stopping: sitting on the floor. ~ wait. ~ mat。 ~ bones. ~ change. ~ Zen. ~ work. ~ ride.

2, take, take: ~ car. ~ boat.

3. persistence, extended to permanent residence, does not move: "Chu people ~ their north gate, is a mountain." ~ Zhuang.

4. The location of the building or its back faces a certain direction: ~. ~ north faces south.

5, put pots, pots, etc. On the fire: ~ pot.

6. The object exerts pressure backwards: the roof is backwards.

Interpretation of Baidu Encyclopedia's "shielding";

1, sitting position: in ~. Tea. ~ talk. Bao ~. There is light in ~ ~.

2. Things for holding utensils. My son.

3, the starry sky area, a star: Star ~. Qin Tian ~

4, quantifiers, mostly used for larger or fixed objects: I ~ mountain.