The coast is an interesting place. There’s always something that is ‘thrown up’/cast up by the sea onto the sand or rocks. Many people go ‘beachcombing’. A beach 海滩 is a sandy 沙 part of the coast. Combing .. well .. you use a comb to comb your hair. You ‘sort out’ your hair ..
Beachcombing 沙滩梳理 – people ‘comb’ the beach just to find things, collect things. Somebody who looks for things on a beach is called a beachcomber.
what do you find on a beach? Well, there’s always a lot of shellfish 贝类 usually ..
This type of shellfish is called a razor fish 剃刀 鱼 (A razor is what a man uses to shave 刮胡子) because it looks like a razor. However, the ‘fish’ inside it has probably been eaten by a hungry seagull …
This type of shellfish are called barnacles 藤壶. They stick/adhere (remain) to rocks. It is very difficult to ‘pull them off’ (difficult to remove them)
A mussel 蚌 cast up (thrown) onto the sand. It also has been eaten by a hungry bird ..
This is a crab’s claw 蟹 爪. You could also call it a ‘pincher’. A crab will ‘pinch’ you with its claw. It will ‘nip’ you …
There are many things that are cast up/washed up on the coast. Some of them are ‘man made’ 人工 – artificial .
It looks like some strange sort of octopus 章鱼 or squid
乌贼
An octopus has 8 tentacles 触须
and a squid has 6. Of course this isn’t real .. it’s man made … It’s made from plastic 塑料 and it is a ‘lure’ 引诱 used by fisherman to catch fish.
Some fish must be pretty (quite) stupid to try and eat this …
An angler with his fishing rod. He is standing in the ‘surf’ and has cast his fishing line into the sea. He will use a hook with bait 饵 on the hook to try and catch a fish
It is very common for an angler to lose fishing line and hooks/bait when the line becomes ‘snagged’/’stuck’ caught on rocks or seaweed.
Fishing line, made from nylon 尼龙. It become entangled (caught) on rocks and seaweed and ‘snaps’ (breaks). The sea washes it ashore where it lies on the sand in a ‘tangle’
A lobster 龙虾pot . These are put into deep water, but the sea still casts/throws them ashore after a storm . More ‘tangled’ fishing line, too.. 
The shoreline (coast) can be described as either ‘rocky’ (many big stones) or sandy – a ‘stretch’ – area of sand. If something is described as ‘windswept’ it just means that there is often a lot of wind. Some parts of the countryside are ‘windswept’. The coast is quite often windswept.
A ‘rocky’ (stones/stony ) stretch of the coastline/shoreline. It is here amongst the rocks that you find rockpools with small marine (sea) creatures in them.
A sandy beach/sandy stretch of the coastline. If you walk along a sandy beach when there is strong wind the sand blows into your eyes and makes your eyes ‘sting’ (hurt). Beachcombers also pick up (collect) pebbles ……
Pebbles 卵石 are stones that have been eroded 侵蚀 by wind or water. Of course, on the coast, pebbles are ‘worn smooth’ by the water and have no sharp/rough edges. 
‘worn and rounded’ pebbles. Different colours with different patterns
And what does a fearless 不怕 dog do on the coast ..?
What a wuss/wimp/scaredy cat … what a coward 懦夫 .. a dog afraid of cold water ..
Teaching in China 