Mnemonic symbol: this character looks a bit like a bat, and bats come out of their caves at dusk. I could see the upper left 丿 as part of the bat's right wing, ㇇ as the body/head and 丶 as the eye of the bat.
Xi Shi (xi) goes out for a space walk in front of the space station (Ø1) in the evening (夕), where she observes a space bat.
石
=
丆
+
口
:
Sherlock Holmes finds the space station's entrance blocked by a big rock. He uses a wind wheel and a mandarin to build a lever, with which he is able to move the rock.
石
=
丆
+
口
:
Sherlock Holmes finds the space station's entrance blocked by a big rock. He uses a wind wheel and a mandarin to build a lever, with which he is able to move the rock.