vigorous = strong
vexing = difficult (not sure) (vex: 使恼怒，使痛苦, puzzle, annoy)
volatile--
vast--immense
vast--great
vehicle--means
variability==tendency to change
withstand==persist >avoid/persist? 原文是：...brick withstood the weathering for a long time...
withstand=resist
wear--use
whatever --in any case/ at any rate/at all event
wary--cautious
way station--stop
？= yet 选项还有however / in addition.
yield--provide