Water is essential to life, an indispensable element of animate and non-animate systems on earth and also a fundamental resource to the national economic and social development.
Not so much, though, as to get in the way of treating China as an indispensable element in any stabilisation of perilous situations in Korea and Afghanistan.
The technique and the concept are two indispensable elements of a good painting.
Therefore, "simplicity", "changing" and "unchanging" constitute three indispensable elements to Yi.
Most of these features are designed for some "jazzy" functionality, but often at the expense of other indispensable elements.
